Check reserved identifiers in function params

[littledivy]

Adds TS1359 validation for function parameter identifiers.

error[TS1359]: ExpectedIdentifierReservedKeyword {
    span: Span {
        lo: BytePos(
            21,
        ),
        hi: BytePos(
            26,
        ),
        ctxt: #0,
    },
}
 --> a.ts:1:20
  |
1 | async function foo(await): Promise<void> {
  |                    ^^^^^

New passing conforming tests:

async/es2017/functionDeclarations/asyncFunctionDeclaration5_es2017.ts

[littledivy]

This should be made context-aware so it can be used with in top level and not just function params. Maybe in the parser? I saw @kdy1 that you have a similar TODO a few lines above.

Similar to https://github.com/microsoft/TypeScript/blob/3d2b4017eb6b9a2b94bc673291e56ae95e8beddd/src/compiler/binder.ts#L2178

[kdy1]

I think it's better to make a method of Analyzer for consistency.
I may refactor it to split the analyzer, but let's use a method at now

[kdy1]

Also, I think this should be handled by the parser.

TS1xxx errors are for parser/lexer