chore: optimize hijack ca format

[jim3ma]

Description

Support inline PEM format for hijacking HTTPS CA

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 52.70%. Comparing base (89e06a8) to head (1648f9e).

Files	Patch %	Lines
client/daemon/proxy/proxy_manager.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3418      +/-   ##
==========================================
- Coverage   52.73%   52.70%   -0.03%     
==========================================
  Files         193      193              
  Lines       20488    20488              
==========================================
- Hits        10804    10798       -6     
- Misses       8878     8882       +4     
- Partials      806      808       +2     

Flag	Coverage Δ
unittests	52.70% <0.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
client/config/peerhost.go	47.46% <ø> (ø)
client/daemon/proxy/proxy_manager.go	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

[gaius-qi]

LGTM