fix(parser): parse const type parameters in arrow function expressions

[dsherret]

Ensures code like the following gets parsed as a const type parameter:

export const fn = <const Data extends ReadonlyArray<unknown>>(payload: Data) => payload;

Also if a type parameter is in / out / const incorrectly, the AST should still reflect that while emitting a diagnostic.

[kdy1]

Thank you!

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swc-bump:

• swc_ecma_parser