Patch httpx client factory to gain more control

[sparfenyuk]

• Enable HTTPS connection without running SSL verification. To do so, export env var MCP_PROXY_VERIFY_SSL=false
• Add HTTPX hooks to log requests and responses. It helps to trace potential connectivity issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main      #94   +/-   ##
=======================================
  Coverage   97.20%   97.20%           
=======================================
  Files           6        6           
  Lines         823      823           
  Branches       30       30           
=======================================
  Hits          800      800           
  Misses         15       15           
  Partials        8        8           

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