Upgrade Solana to v2 and SPL to the latest

[acheroncrypto]

Problem

Solana v2 has been out for some time, but we still depend on v1.

Summary of changes

• Upgrade all Solana dependencies and toolchain to v2
• Upgrade all SPL dependencies to current latest versions that are compatible with Solana v2
• Use Pod exported from anchor-lang for get_mint_extension_data because Pod is no longer exported from spl-token-2022
• max_size parameter of token_group_initialize instruction has been changed to u64 (due to the underyling changes in the Token 2022's initialize_group instruction)
• Update the setup script to install Solana v2.0.8 and switch to agave-install

[vercel]

@acheroncrypto is attempting to deploy a commit to the coral-xyz Team on Vercel.

A member of the Team first needs to authorize it.

[acheroncrypto]

mpl-token-metadata is not compatible with Solana v2 (metaplex-foundation/mpl-token-metadata#127):

error[E0308]: mismatched types
   --> src/metadata.rs:887:9
    |
886 |     fn id() -> Pubkey {
    |                ------ expected `anchor_lang::prelude::Pubkey` because of return type
887 |         ID
    |         ^^ expected `anchor_lang::prelude::Pubkey`, found `solana_program::pubkey::Pubkey`
    |
    = note: `solana_program::pubkey::Pubkey` and `anchor_lang::prelude::Pubkey` have similar names, but are actually distinct types
note: `solana_program::pubkey::Pubkey` is defined in crate `solana_program`
   --> src/pubkey.rs:88:1
note: `anchor_lang::prelude::Pubkey` is defined in crate `solana_program`
   --> src/pubkey.rs:96:1
    = note: perhaps two different versions of crate `solana_program` are being used?