Features:

• Move to new validator selection and sampling algorithm. Now we would be able to use all available seats. First step to enable chunk only producers. #5425
• Further lower regular_op_cost from 2_207_874 to 822_756: #5365
• Limit number of wasm functions in one contract to 10_000. #4954
• Add block header v3, required by new validator selection algorithm #5425

CODE_COLOR: CODE_YELLOW_TESTNET
RELEASE_VERSION: 1.23.0-rc.1
PROTOCOL_UPGRADE: TRUE
DATABASE_UPGRADE: TRUE
SECURITY_UPGRADE: FALSE