http2: add support for TypedArray to getUnpackedSettings

This PR is trying to fix the behaviour of http2.getUnpackedSettings.

$ node --version
v16.0.0-pre
$ node -e "http2.getUnpackedSettings('')"
node:internal/http2/core:3167
    throw new ERR_INVALID_ARG_TYPE('buf',
    ^

TypeError [ERR_INVALID_ARG_TYPE]: The "buf" argument must be an instance of Buffer, TypedArray, or DataView. Received type string ('')
    at new NodeError (node:internal/errors:258:15)
    at Object.getUnpackedSettings (node:internal/http2/core:3167:11)
    at [eval]:1:7
    at Script.runInThisContext (node:vm:132:18)
    at Object.runInThisContext (node:vm:309:38)
    at node:internal/process/execution:77:19
    at [eval]-wrapper:6:22
    at evalScript (node:internal/process/execution:76:60)
    at node:internal/main/eval_string:23:3 {
  code: 'ERR_INVALID_ARG_TYPE'
}
$ node -e "http2.getUnpackedSettings(new Uint8Array([0,0,0,0,0,0]))"
node:internal/http2/core:3175
    const id = buf.readUInt16BE(offset);
                   ^

TypeError: buf.readUInt16BE is not a function
    at Object.getUnpackedSettings (node:internal/http2/core:3175:20)
    at [eval]:1:7
    at Script.runInThisContext (node:vm:132:18)
    at Object.runInThisContext (node:vm:309:38)
    at node:internal/process/execution:77:19
    at [eval]-wrapper:6:22
    at evalScript (node:internal/process/execution:76:60)
    at node:internal/main/eval_string:23:3

The error message says we can use TypedArray, the documentation says we can use Uint8Array, but in practice only Node.js Buffer object are accepted.

This PR adds support for all TypedArray and remove DataView from the error message. It also updates the documentation.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines