gRPC Swift 1.23.0

SemVer Minor

• Add reflection support to plugin (#1835, patch credit to @samisuteria)
• Add subpool stats (#1852)

SemVer Patch

• Remove GRPCLogger (#1853)
• Bump version number to 1.23.0 (#1863)

Other Changes

• Update formatting script (#1845)
• Update release GitHub workflow action (#1847, #1848)