* initial
* update
* fix: add validator to NewBlockchain function calls
* handle past chain reorg
* fix: only check with last checkpoint
* rm logs
* add: handle future chain import case
* fix: handle single block case
* add unit tests for past and future chain
* modularise forker tests
* minor fixes
* add: overlapping chain test case, minor fixes
* minor fixes
* add: isolated unit test for IsValidChain
* add more test case for IsValidChain
* fix: use index for header time
* add: fetch last N checkpoints in first run
* fix: change checkpoint count to int64
* fix: handle edge case
* fix: handle no checkpoint case separately
* fix: consider offset for future chain calculation
* re-write test case for split chain
* fix: typo
* add: split chain properties test
* separate reorg checks, validate chain before inserting
* fix: handle err incase of invalid chain
* fix: use error from whitelist service
* split chain property tests
* remove duplicate test cases
* cleanup
* clean up
* fix linters
* fix: fetch checkpoint count bug, add tests
* fix more linters
* fix: handle nil chain validator in downloader
* fix: mock bor tests
Co-authored-by: Evgeny Danienko <6655321@bk.ru>
Cleanup, lint, and enable linters for consenssus/bor module.
Disabled linter "gomnd" and "tagliatelle" because they are not
easy to fix and the return on the time investment is very low.
Disabled linter "prealloc" because it is not easy to guess and pre-allocate the
slice accurately in many cases.
