Support client authority in config profiles

[kevinawoo]

Summary

• Add a persisted client_authority profile property, with client-authority accepted as a flag-style alias.
• Round-trip envconfig additional profile fields so config rewrites preserve unknown TOML keys, including client_authority.
• Apply configured client authority to CLI client options unless --client-authority is explicitly set.

Root Cause

client-authority existed as a runtime client flag, but temporal config set only accepted properties backed by the SDK envconfig profile reflection map. Since envconfig has no ClientAuthority field, the property was rejected and could not be persisted.

Validation

• go test -mod=readonly ./internal/temporalcli -run 'TestApplyClientAuthorityFromConfig|TestConfig' -count=1
• go test ./... -count=1 currently fails before running tests in this checkout because the ignored local vendor/ directory is incomplete (vendor/modules.txt is missing), so Go reports inconsistent vendoring. Use -mod=readonly here or regenerate vendor from a clean vendor directory.