refactor(go): refactor WithTLS

[chengxilo]

Which issue does this PR close?

N/A

Rationale

Currently, the TLS options requiring a user to call WithTLS(true) in addition to WithTLSDomain or WithTLSCAFile. This is redundant and error-prone. If a user provides a domain or a CA file, the intent to use TLS is already clear.

We can use nested option pattern for it, therefore we can create client like this:

cli, err := client.NewIggyClient(
	client.WithTcp(
		tcp.WithServerAddress(connectAddr),
		tcp.WithTLS(
			tcp.WithTLSCAFile(caFile),
			tcp.WithTLSDomain("localhost"),
		),
	),
)

What changed?

1. Refactor WithTLS method.
2. Extract TLS configuration struct, group all TLS-related parameters together

Local Execution

• Passed
• Pre-commit hooks ran

AI Usage

1. Claude Sonnet 4.6
2. code generation
3. I reviewed the code and tested
4. Sure

[codecov]

Codecov Report

❌ Patch coverage is 37.93103% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.47%. Comparing base (79103ee) to head (f0e754b).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
foreign/go/client/tcp/tcp_core.go	37.93%	18 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2957      +/-   ##
============================================
+ Coverage     70.35%   70.47%   +0.11%     
+ Complexity      925      776     -149     
============================================
  Files          1050     1041       -9     
  Lines         86936    86181     -755     
  Branches      64491    62443    -2048     
============================================
- Hits          61167    60734     -433     
+ Misses        23260    22931     -329     
- Partials       2509     2516       +7     

Flag	Coverage Δ
go	36.38% <37.93%> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
foreign/go/client/tcp/tcp_core.go	47.80% <37.93%> (+0.05%)	⬆️

... and 259 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.