Add --hotkeys-samples option for Valkey-cli

[hwware]

Now we only have --hotkeys option, and the default output value is 16.
This PR add one more option for hotkeys as "--hotkeys-samples", users have chance to specific how many output items they want.

Example 1:

./src/valkey-cli --hotkeys-samples 10

[00.00%] Hot key '"memtier-3308"' found so far with counter 5
[00.00%] Hot key '"memtier-23516"' found so far with counter 5
[00.00%] Hot key '"memtier-16678"' found so far with counter 5
[00.00%] Hot key '"memtier-25001"' found so far with counter 5
[00.00%] Hot key '"memtier-63829"' found so far with counter 5
[00.00%] Hot key '"memtier-21281"' found so far with counter 5
[00.00%] Hot key '"memtier-81379"' found so far with counter 5
[00.00%] Hot key '"memtier-30335"' found so far with counter 5
[00.00%] Hot key '"memtier-87521"' found so far with counter 5
[00.00%] Hot key '"memtier-42166"' found so far with counter 5

-------- summary -------

Sampled 100000 keys in the keyspace!
hot key found with counter: 5 keyname: "memtier-3308"
hot key found with counter: 5 keyname: "memtier-23516"
hot key found with counter: 5 keyname: "memtier-16678"
hot key found with counter: 5 keyname: "memtier-25001"
hot key found with counter: 5 keyname: "memtier-63829"
hot key found with counter: 5 keyname: "memtier-21281"
hot key found with counter: 5 keyname: "memtier-81379"
hot key found with counter: 5 keyname: "memtier-30335"
hot key found with counter: 5 keyname: "memtier-87521"
hot key found with counter: 5 keyname: "memtier-42166"

Example 2:

./src/valkey-cli --hotkeys-samples 20

[00.00%] Hot key '"memtier-3308"' found so far with counter 5
[00.00%] Hot key '"memtier-23516"' found so far with counter 5
[00.00%] Hot key '"memtier-16678"' found so far with counter 5
[00.00%] Hot key '"memtier-25001"' found so far with counter 5
[00.00%] Hot key '"memtier-63829"' found so far with counter 5
[00.00%] Hot key '"memtier-21281"' found so far with counter 5
[00.00%] Hot key '"memtier-81379"' found so far with counter 5
[00.00%] Hot key '"memtier-30335"' found so far with counter 5
[00.00%] Hot key '"memtier-87521"' found so far with counter 5
[00.00%] Hot key '"memtier-42166"' found so far with counter 5
[00.00%] Hot key '"memtier-6370"' found so far with counter 5
[00.01%] Hot key '"memtier-37381"' found so far with counter 5
[00.01%] Hot key '"memtier-95045"' found so far with counter 5
[00.01%] Hot key '"memtier-14027"' found so far with counter 5
[00.01%] Hot key '"memtier-60370"' found so far with counter 5
[00.01%] Hot key '"memtier-98622"' found so far with counter 5
[00.01%] Hot key '"memtier-18642"' found so far with counter 5
[00.01%] Hot key '"memtier-39260"' found so far with counter 5
[00.01%] Hot key '"memtier-64371"' found so far with counter 5
[00.01%] Hot key '"memtier-27099"' found so far with counter 5

-------- summary -------

Sampled 100000 keys in the keyspace!
hot key found with counter: 5 keyname: "memtier-3308"
hot key found with counter: 5 keyname: "memtier-23516"
hot key found with counter: 5 keyname: "memtier-16678"
hot key found with counter: 5 keyname: "memtier-25001"
hot key found with counter: 5 keyname: "memtier-63829"
hot key found with counter: 5 keyname: "memtier-21281"
hot key found with counter: 5 keyname: "memtier-81379"
hot key found with counter: 5 keyname: "memtier-30335"
hot key found with counter: 5 keyname: "memtier-87521"
hot key found with counter: 5 keyname: "memtier-42166"
hot key found with counter: 5 keyname: "memtier-6370"
hot key found with counter: 5 keyname: "memtier-37381"
hot key found with counter: 5 keyname: "memtier-95045"
hot key found with counter: 5 keyname: "memtier-14027"
hot key found with counter: 5 keyname: "memtier-60370"
hot key found with counter: 5 keyname: "memtier-98622"
hot key found with counter: 5 keyname: "memtier-18642"
hot key found with counter: 5 keyname: "memtier-39260"
hot key found with counter: 5 keyname: "memtier-64371"
hot key found with counter: 5 keyname: "memtier-27099"

[codecov]

Codecov Report

Attention: Patch coverage is 4.54545% with 21 lines in your changes missing coverage. Please review.

Project coverage is 70.95%. Comparing base (44dafba) to head (76987a6).
Report is 2 commits behind head on unstable.

Files with missing lines	Patch %	Lines
src/valkey-cli.c	4.54%	21 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1933      +/-   ##
============================================
- Coverage     70.99%   70.95%   -0.04%     
============================================
  Files           123      123              
  Lines         65769    65786      +17     
============================================
- Hits          46693    46680      -13     
- Misses        19076    19106      +30     

Files with missing lines	Coverage Δ
src/valkey-cli.c	55.94% <4.54%> (-0.15%)	⬇️

... and 13 files with indirect coverage changes

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[zuiderkwast]

I'm not sure "samples" is the right name for this. Samples already means how many keys were checked. The output says

Sampled 100000 keys in the keyspace!

Maybe --hotkeys-count?

[PingXie]

+1 on "hotkeys-count". Changes LGTM overall. We should add documentation too.