Extract account-decoder-client-types

[kevinheavey]

Problem

rpc_client needs only a small subset of account_decoder. It brings in some very heavy dependencies such as spl-token-2022, which we can avoid

Summary of Changes

• Rip the necessary types for rpc_client and rpc_client_api from acocunt_decoder into a new account_decoder_client_types crate.
• Make zstd optional in the new crate
• convert UiAccount::encode to a free func encode_ui_account
• replace a bunch of From impls with free functions to avoid pulling in dependencies. These impls do not fall under the supported APIs outlined here: https://docs.solanalabs.com/backwards-compatibility#rust-crates

On my machine this improves release build time for rpc_client_api by 36%.

This PR branches off #2870 so either that should be merged first, or we merge this as one big PR and close #2870

[mergify]

If this PR represents a change to the public RPC API:

1. Make sure it includes a complementary update to rpc-client/ (example)
2. Open a follow-up PR to update the JavaScript client @solana/web3.js (example)

Thank you for keeping the RPC clients in sync with the server API @kevinheavey.

[buffalojoec]

Lgtm @kevinheavey, just the question on decode!

[buffalojoec]

Are these extra keys necessary here? I don't see them used anywhere else in the monorepo.

[buffalojoec]

Why not also make this one a free function, like its encode counterpart? Then you can drop the bs_58 dependency from this crate, possibly more.