feat/1098 - SDK: Add remaining Transfer types

[jurevans]

Resolves #1098

Mainly we want to add support to MASP to the SDK & the Interface. Short of implementing the Transfer UI, we should have the following:

Need args and Borsh schema for:

• Shielded Transfer (Shielded<->Shielded)
• Shielding Transfer (Transparent->Shielded)
• Unshielding Transfer (Shielding->Shielded)

Need SDK (@heliax/namada-sdk) functions for:

• build_shielded_transfer
• build_shielding_transfer
• build_unshielding_transfer

Docs:

• Regenerate docs for @namada/types @heliax/namada-sdk

TODO:

• Load MASP Params into SDK wasm (fetch & store, provide to SDK)

[pedrorezende]

Typescript part LGTM! Let's wait for @mateuszjasiuk or @emccorson review for Rust part :)

[mateuszjasiuk]

LGMT!