Conflux v2.3.0-testnet

This release introduces a new hardfork. All nodes should be upgraded before the epoch number reaches 129100000 (estimated on Jul 04). CIPs will be enabled when the block number reaches 167000000 (estimated on Jul 04), and CIP-113 will be enabled when the PoS block number reaches 741900 (estimated on Jul 04).

Incompatible Changes

• CIP-107 (https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-107.md): This CIP introduces "storage point" a burning mechanism of storage collateral.
• CIP-112 (https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-112.md): This CIP fixes the incorrect encoding and decoding implementation of the custom field of block headers.
• CIP-113 (https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-113.md): This CIP makes the PoS finalization faster by shortening the PoS consensus round time and the pivot decision signing wait time

RPC Improvement

• Fix the hex encoding of PoS keys and signatures in pos RPCs.
• Return both compressed and uncompressed BLS public keys in PoS ledger info.