Release v0.22.1

What's Changed

• Add a doc field on Function and update content advice by @TristonianJones in #446
• Upgrade the googleapis repo deps, remove switched_rules by @TristonianJones in #447
• Add a separate field for expressions under input bindings map by @aakash070 in #449
• Add java_lite messages to test_all_types messages by @l46kok in #450

Full Changelog: v0.22.0...v0.22.1