Upgrade protobuf to 27.1 and modernize codegen using new APIs (e.g. h…

…as_presence()) (#1445)

Fixes #1437.

Bump version to 1.5.0 (#1382)

Bump version to 1.4.2 (#1298)

Bump version to 1.4.1 (#1287)

Bump protoc plugin version to `1.4.0` (#1282)

Bump version to 1.3.1 (#1195)

Bump version to 1.3.0 (#1145)

Review fixes

Refactor error handling in grpcwebclientbase

All interop tests work now.