Support for `max_metadata_size` in grpc-js

### Problem description
Is `grpc.max_metadata_size` supported in `grpc-js` ?
If so, then what is the maximum allowed value for this ?

### Environment
- OS name, version and architecture: [e.g. MacOS Monterey 12.0.1]
- Node version 14.17.4
- Node installation method nvm
- Package name and version `@grpc/grpc-js:^1.5.5`

### Additional context
* I have migrated from "grpc" to "grpc-js".
* On going through the interop tests [here](https://github.com/grpc/grpc-node/pull/1571/files#diff-7aacea1567fae9a30c435061805ffe339e568a744b150f1ef53625037f8238e6R80), I noticed that `grpc.max_metadata_size` is being used.
* However the documentation for `grpc-js`at npm does not list `grpc.max_metadata_size` as a valid channel option.
* This is also not mentioned in `ChannelOptions` type.