feat: adds command for mcp server

[KapilSareen]

This PR aims to add func mcp command which can be used to start a MCP (Model Context Protocol) server.

Part of #2690

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: KapilSareen
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[knative-prow]

Hi @KapilSareen. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov]

Codecov Report

Attention: Patch coverage is 48.33333% with 31 lines in your changes missing coverage. Please review.

Project coverage is 63.41%. Comparing base (a062cd2) to head (5c071b5).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/mcp/mcp.go	0.00%	21 Missing ⚠️
cmd/mcp.go	69.69%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2836      +/-   ##
==========================================
+ Coverage   62.64%   63.41%   +0.77%     
==========================================
  Files         127      129       +2     
  Lines       15533    15631      +98     
==========================================
+ Hits         9730     9912     +182     
+ Misses       4892     4776     -116     
- Partials      911      943      +32     

Flag	Coverage Δ
e2e-tests	43.64% <48.33%> (+1.51%)	⬆️
integration-tests	49.41% <48.33%> (+1.80%)	⬆️
unit-tests	49.54% <48.33%> (+0.04%)	⬆️

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