feat: adds candid-wasm-bindgen library for npm

[krpeacock]

Overview
To facilitate any workflow where someone wants to dynamically generate IDL from declarations, this bundles functionality from Candid into utility methods for string -> file output using wasm-pack

Since IO is not available in a wasm browser context, I had to make changes so that File types were not required

Considerations
What impact will this change have on security, performance, users (e.g. breaking changes) or the team (e.g. maintenance costs)?

[github-actions]

Benchmark for d78e16e

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Test	Base	PR	%
Blob/&str	263.7±143.29µs	263.3±125.64µs	-0.15%
Blob/ByteBuf	163.9±44.30µs	164.2±44.13µs	+0.18%
Blob/Bytes	121.9±41.41µs	110.3±40.63µs	-9.52%
Blob/String	311.3±152.49µs	309.6±144.29µs	-0.55%
Collections/vec (text, nat)	75.0±1.51ms	76.9±1.48ms	+2.53%
Collections/vec int	33.2±0.12ms	33.4±0.10ms	+0.60%
Collections/vec int64	22.5±0.46ms	26.9±0.33ms	+19.56%
Collections/vec nat8	17.8±0.04ms	21.6±0.08ms	+21.35%
option list/1024	2.4±0.01ms	2.4±0.00ms	0.00%
profiles/1024	4.2±0.11ms	4.2±0.06ms	0.00%
variant list/1024	2.3±0.01ms	2.3±0.02ms	0.00%

[chenyan-dfinity]

Mostly LG. Is it better to host this in agent-js repo? With the new ic-verify-bls-signature crate, we probably need a similar npm package there.

[github-actions]

Benchmark for 4fbffc6

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Test	Base	PR	%
Blob/&str	279.0±151.63µs	268.9±147.08µs	-3.62%
Blob/ByteBuf	193.7±48.08µs	191.1±53.84µs	-1.34%
Blob/Bytes	138.4±45.85µs	129.6±46.03µs	-6.36%
Blob/String	345.7±154.93µs	331.2±153.49µs	-4.19%
Collections/vec (text, nat)	87.8±3.08ms	79.5±3.35ms	-9.45%
Collections/vec int	38.2±1.44ms	37.8±1.87ms	-1.05%
Collections/vec int64	24.7±1.14ms	25.4±2.02ms	+2.83%
Collections/vec nat8	21.0±0.69ms	20.0±0.56ms	-4.76%
option list/1024	2.6±0.10ms	2.7±0.09ms	+3.85%
profiles/1024	4.6±0.20ms	4.8±0.19ms	+4.35%
variant list/1024	2.7±0.12ms	2.7±0.08ms	0.00%

[github-actions]

Benchmark for e3d7dfc

Click to view benchmark

Test	Base	PR	%
Blob/&str	234.4±69.40µs	243.1±69.82µs	+3.71%
Blob/ByteBuf	165.6±46.47µs	166.6±44.87µs	+0.60%
Blob/Bytes	110.6±30.96µs	114.9±29.99µs	+3.89%
Blob/String	237.8±68.33µs	262.9±79.47µs	+10.56%
Collections/vec (text, nat)	74.6±1.12ms	74.0±1.54ms	-0.80%
Collections/vec int	33.4±0.15ms	33.1±0.13ms	-0.90%
Collections/vec int64	23.4±0.36ms	23.0±0.32ms	-1.71%
Collections/vec nat8	17.2±0.07ms	17.2±0.03ms	0.00%
option list/1024	2.4±0.01ms	2.4±0.02ms	0.00%
profiles/1024	4.2±0.02ms	4.2±0.01ms	0.00%
variant list/1024	2.4±0.03ms	2.4±0.01ms	0.00%