feat: add codex mcp client

[Mansehej]

Added support for the Codex MCP client using the Codex CLI commands inspired by how the Claude Code CLI client was implemented

[joshsny]

Thank you 💖

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@e7f3388). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...c/steps/add-mcp-server-to-clients/clients/codex.ts	92.00%	4 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #157   +/-   ##
=======================================
  Coverage        ?   31.14%           
=======================================
  Files           ?       54           
  Lines           ?     2392           
  Branches        ?      499           
=======================================
  Hits            ?      745           
  Misses          ?     1646           
  Partials        ?        1           

Flag	Coverage Δ
unit-tests	31.14% <92.15%> (?)

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