feat: add row-level security proto APIs

[aoiasd]

Issue

• [Feature]: Support Row Level Security milvus#50263
• Related: enhance: Support row level security #452

What

• Add row-level security row policy APIs, including UpdateRowPolicy.
• Add RLS principal tag APIs for set/get/list/delete.
• Add rls_principal and skip_rls request fields for insert, upsert, delete, search, hybrid search, and query.
• Add PrivilegeSkipRLS and RLS message types.
• Regenerate Go proto bindings.

Notes

• SearchRequest uses field numbers 25/26 for RLS fields to avoid the existing function_chains = 24.
• HybridSearchRequest uses field numbers 16/17 for RLS fields to avoid the existing function_chains = 15.

Verification

• make generate-proto
• git diff --check
• (cd go-api && go test ./...)

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