Support msec timestamp and 500 epoch length in BEP520

[yoshidan]

https://github.com/bnb-chain/BEPs/blob/master/BEPs/BEP-520.md

[Copilot]

Pull Request Overview

This PR implements BEP520 support by updating the timestamp format to use millisecond precision and changing the epoch length from 200 to 500.

• Updated logging and state extraction to convert timestamps using a new MilliTimestamp helper.
• Adjusted test expectations and constants to accommodate the new 500-block epoch length and modified turnLength parameters.
• Made related updates in CI configurations and docker-compose files to reflect the new epoch length and branch requirements.

Reviewed Changes

Copilot reviewed 14 out of 18 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tool/testdata/internal/create_client.go	Converts epoch hash outputs from module.MakeEpochHash to a common.Hash
tests/prover_network_test.go	Updates expected timestamp value using MilliTimestamp
module/vote_test.go	Adjusts expected vote attestation values to new block and signature logic
module/validator_set_test.go	Changes expected turnLength value from 1 to 6
module/setup_test.go	Revises header query tests and expected block numbers based on new epoch
module/prover.go	Switches timestamp conversion to MilliTimestamp
module/lib_test.go	Updates RLP strings for various header functions
module/header_query_test.go	Adjust test configurations for header queries based on updated epochs
module/header.go	Introduces MilliTimestamp to compute msec timestamps using MixDigest
module/constant/production.go	Updates BlocksPerEpoch constant from 200 to 500
module/constant/development.go	Removes development override for BlocksPerEpoch
e2e/chains/bsc/docker-compose.simple.yml	Removes BLOCKS_PER_EPOCH override from environment variables
e2e/chains/bsc/docker-compose.bsc.yml	Changes branch checkout from v1.5.5 to develop
.github/workflows/ci.yml	Increases wait time in CI to accommodate the new epoch length

Files not reviewed (4)

• e2e/Makefile: Language not supported
• e2e/chains/bsc/genesis/genesis-template.template: Language not supported
• e2e/chains/bsc/scripts/bootstrap.sh: Language not supported
• go.mod: Language not supported

Comments suppressed due to low confidence (3)

module/header.go:76

• [nitpick] Consider adding documentation or inline comments to clarify the assumption that the lower 64 bits of MixDigest represent the millisecond remainder. This will help maintainers understand the logic for converting the header's timestamp into millisecond precision.

func MilliTimestamp(h *types.Header) uint64 {

.github/workflows/ci.yml:60

• [nitpick] The increased sleep duration (1500 seconds) for waiting for 1000 blocks may significantly extend the CI build time. Verify that this delay is necessary or consider alternative strategies to avoid potential timeouts in the pipeline.

sleep 1500

module/setup_test.go:167

• The accompanying comment states 'checkpoint = 18' while the expected block number is 1517. Please verify that the expected header number is correct given the new turnLength and epoch configuration.

ts.Require().Equal(int64(1517), target.Number.Int64())