Add JSON Schema validations

[KendallWeihe]

Leverage Rust build script to automatically generate the JSON Schemas at https://github.com/TBD54566975/tbdex/blob/main/hosted/json-schemas into source code. This way it's all included in the single binary.

A few places with // 🚧 TODO commenting out until did:dht support

[nitro-neal]

so this is pretty cool.

I guess an alternative would be just to copy paste the schemas in a folder, and then have a static function lazy load them programmatically ?

[KendallWeihe]

so this is pretty cool.

I guess an alternative would be just to copy paste the schemas in a folder, and then have a static function lazy load them programmatically ?

I think we have room for improvement, but a killer feature here is embedded this into the binary itself. Improves portability and resiliency across environments.

[decentralgabe]

which version(s) of JSON Schema does this work with?

[KendallWeihe]

which version(s) of JSON Schema does this work with?

We're using the jsonschema crate.

From the jsonschema crates.io page:

Supported drafts:

- Draft 7 (except optional idn-hostname.json test case)
- Draft 6
- Draft 4 (except optional bignum.json test case)

Partially supported drafts (some keywords are not implemented):

- Draft 2019-09 (requires the draft201909 feature enabled)
- Draft 2020-12 (requires the draft202012 feature enabled)