refactor[websocket]: improve websocket factory start

[luislhl]

Motivation

I had a problem while trying to write a test for run_node.py in another PR. The reason was that the HathorAdminWebsocketFactory was started and never stopped.

I noticed that its stop method was never called, and its start was called inside ResourcesBuilder.create_resources, which was unlike any other resource we start.

I've included a test similar to the one I had problems with to make my difficulties clearer.

Acceptance Criteria

• The HathorAdminWebsocketFactory should be started as a consequence of starting the Manager, and should be stopped when the Manager is stopped
• There should be no impact in the overall logic of hathor-core. Everything should work like before.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	chore/improve-websocket-factory-start
Testbed	ubuntu-22.04

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Benchmark	Latency	Benchmark Result nanoseconds (ns) (Result Δ%)	Lower Boundary nanoseconds (ns) (Limit %)	Upper Boundary nanoseconds (ns) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	101,433,125,219.18 (-0.47%)	91,721,030,329.48 (90.43%)	112,103,481,513.80 (90.48%)

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[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.47%. Comparing base (22f478c) to head (09e7c50).

Files with missing lines	Patch %	Lines
hathor/builder/sysctl_builder.py	0.00%	1 Missing ⚠️
hathor/metrics.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1145      +/-   ##
==========================================
- Coverage   84.50%   84.47%   -0.04%     
==========================================
  Files         317      317              
  Lines       24384    24389       +5     
  Branches     3707     3709       +2     
==========================================
- Hits        20606    20602       -4     
- Misses       3069     3072       +3     
- Partials      709      715       +6     

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