feat: render tuples

[thlorenz]

Summary

Renders tuples (indicated via tuple in the IDL).

This supports tuples nested inside other types as in the below example as well as tuples whose elements themselves are composites.

A part of nft-packs IDL was included to serve as a smoke-test and more detailed tests were added to the typemapper.

Example

Rendering Vec<u32, u32, u32>

export type PackConfig = {
  weights: [number, number, number][]
}

export const packConfigBeet = new beet.FixableBeetArgsStruct<PackConfig>(
  [
    [
      'weights',
      beet.array(beet.fixedSizeTuple([beet.u32, beet.u32, beet.u32])),
    ],
  ],
  'PackConfig'
)