feat: add protocol feature flags for conditional compilation

[seokjin0414]

Closes #88

Summary

• Add tcp, quic, http, websocket feature flags to server, SDK, iggy_common, and configs crates
• Guard protocol modules, SenderKind/ClientWrapper enum variants, and match arms with #[cfg(feature)]
• Make protocol-specific dependencies optional (axum, quinn, reqwest, tokio-tungstenite, etc.)
• Extract shared TLS verifier to tls/ module for tcp/websocket independence
• Add compile_error! guards for zero-protocol builds

Design

• TransportProtocol enum, IggyError variants, ServerConfig fields: NOT gated — wire protocol and config stability
• SenderKind (iggy_common): Variants gated per protocol (tcp, quic, websocket). HTTP uses axum, not SenderKind
• ClientWrapper (SDK): Variants gated per protocol. Dispatch match arms in 13 binary_*.rs files gated accordingly
• Default features: All protocols enabled — existing behavior unchanged
• compio dep: Kept as-is (workspace dep with all features). Code-level gating only; compio feature split deferred to follow-up

Verified

• All 18 feature combinations compile (single-protocol, multi-protocol, zero-protocol error)
• cargo clippy --all-features -D warnings clean
• cargo fmt clean
• Single-protocol builds produce 0 warnings

[codecov]

Codecov Report

❌ Patch coverage is 70.10309% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.51%. Comparing base (2eefbc3) to head (97dc578).

Files with missing lines	Patch %	Lines
core/sdk/src/client_provider.rs	25.00%	18 Missing ⚠️
core/sdk/src/tls/no_server_verification.rs	79.48%	8 Missing ⚠️
core/sdk/src/clients/client.rs	0.00%	1 Missing ⚠️
core/sdk/src/clients/client_builder.rs	0.00%	1 Missing ⚠️
core/server/src/shard/handlers.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2845      +/-   ##
============================================
- Coverage     67.53%   67.51%   -0.02%     
  Complexity      739      739              
============================================
  Files          1048     1048              
  Lines         84103    84145      +42     
  Branches      60704    60757      +53     
============================================
+ Hits          56795    56808      +13     
- Misses        24950    24966      +16     
- Partials       2358     2371      +13     

Flag	Coverage Δ
csharp	67.06% <ø> (-0.19%)	⬇️
go	6.33% <ø> (ø)
java	54.83% <ø> (ø)
node	92.26% <ø> (-0.07%)	⬇️
python	0.00% <ø> (ø)
rust	69.70% <70.10%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
core/common/src/sender/mod.rs	90.47% <ø> (ø)
...ration/websocket_config/websocket_client_config.rs	61.44% <100.00%> (ø)
core/configs/src/server_config/websocket.rs	14.70% <ø> (ø)
core/sdk/src/client_wrappers/binary_client.rs	100.00% <ø> (ø)
...e/sdk/src/client_wrappers/binary_cluster_client.rs	100.00% <ø> (ø)
...rc/client_wrappers/binary_consumer_group_client.rs	85.71% <ø> (ø)
...c/client_wrappers/binary_consumer_offset_client.rs	100.00% <ø> (ø)
...e/sdk/src/client_wrappers/binary_message_client.rs	100.00% <ø> (ø)
...sdk/src/client_wrappers/binary_partition_client.rs	100.00% <ø> (ø)
...nt_wrappers/binary_personal_access_token_client.rs	100.00% <ø> (ø)
... and 22 more

... and 17 files with indirect coverage changes

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