Protoc-gen-validate

What's Changed
* Bump python version number by emoreth in https://github.com/envoyproxy/protoc-gen-validate/pull/501
* Move X macro list for C++ harness closer to includes by akonradi in https://github.com/envoyproxy/protoc-gen-validate/pull/506
* Allow to detect wellknown types in nested messages by becoded in https://github.com/envoyproxy/protoc-gen-validate/pull/505
* Bump dependencies by becoded in https://github.com/envoyproxy/protoc-gen-validate/pull/507
* readme: use inclusive language by gumpt in https://github.com/envoyproxy/protoc-gen-validate/pull/512
* Make iteration order for Go maps consistent by akonradi in https://github.com/envoyproxy/protoc-gen-validate/pull/518
* Add missing WktNested to C++, Java, Python harnesses by akonradi in https://github.com/envoyproxy/protoc-gen-validate/pull/517
* undef conflicting symbols on Windows by amincheloh in https://github.com/envoyproxy/protoc-gen-validate/pull/509
* supporting using different maven repo by hangsu-ma in https://github.com/envoyproxy/protoc-gen-validate/pull/519
* Perform Go map key sorting inside a scope by akonradi in https://github.com/envoyproxy/protoc-gen-validate/pull/522

New Contributors
* emoreth made their first contribution in https://github.com/envoyproxy/protoc-gen-validate/pull/501
* becoded made their first contribution in https://github.com/envoyproxy/protoc-gen-validate/pull/505
* gumpt made their first contribution in https://github.com/envoyproxy/protoc-gen-validate/pull/512
* amincheloh made their first contribution in https://github.com/envoyproxy/protoc-gen-validate/pull/509
* hangsu-ma made their first contribution in https://github.com/envoyproxy/protoc-gen-validate/pull/519

**Full Changelog**: https://github.com/envoyproxy/protoc-gen-validate/compare/v0.6.1...v0.6.2

Changes
- Remove support for returning multiple validation errors. This feature caused silent breakage of validations for consumers due to an API change.

- In generated Go code, allows returning a list of validation errors instead of only the first failed.
- Adds support for the `module=example.com/foo` flag described [here](https://developers.google.com/protocol-buffers/docs/reference/go-generated#invocation)
- Removes all references to `github.com/golang/protobuf` in favor of `google.golang.org/protobuf`

Changes
- Example workspace to demonstrate Bazel usage
- Fix Bazel rules for validation code generation
- Support for newer TLDs in email validation

Changes
- reduce minimum required Go version
- bug fixes for existing rules
- ability to suppress validation generation
- bump protobuf version to v3.14.0
- improve Bazel support
- PyPi packaging for Python