Add Codama IDL type

[febo]

This PR adds a new IdlType variant to represent Codama IDLs on the include-idl crate.

The way the IDL is stored was also refactored to include its type in a separate section:

• .idl.type: type of the IDL (bytes of "anchor" or "codama")
• .idl.data: compressed data of the IDL file

The CLI was updated to retrieve the IDL under the standard section headers:

$ include-idl-cli parse ../programs/.bin/asset_program.so`

Program IDL (codama)
============================
{"additionalPrograms":[],"kind":"rootNode","program":{"accounts":[{"data":
{"fields":[{"docs":[],"kind":"structFieldTypeNode","name":"discriminator","type":
{"kind":"definedTypeLinkNode","name":"discriminator"}},{"docs":[],"kind"
...