chore: registry program cleanup

[ananas-block]

Changes:

• add security txt
• add cpi context init to state Merkle tree init function
• check that cpi context is of correct size
• split RolloverMerkleTreeAndQueue instruction into two to acommodate account loaders for state and address Merkle trees
  • account loaders are needed to check for network fee
• rename ForesterAccount -> ForesterPda
• add sanity protocol config checks for init and update
• add placeholders in ProtocolConfig