* proper error handling for blockchain instantiation

* nil check on ethstats

* nil check over ourTD

…ne (#1757)

* purge whitelisted entries, bypass validation for incorrect milestone

* small log change

* small log change

* chore: bump kurtosis-pos

* chore: change state sync test

* Periodically check canonical chain with latest milestone

Handle the edge case where a milestone arrives in the middle of chain import, where the imported chain is on a wrong fork.

* Address CR comment

* feat: witness rpc endpoints

* fix: lint

* chore: RPCMarshalWitness

* chore: move endpoints behind a flag

* chore: make docs

When a milestone doesn't match a local block, we should return an hash mismatch error, so the milestone would be kept for future evaluation.

…entry (#1764)

* eth/downloader/whitelist: remove redundant read lock

* eth/downloader/whitelist: move metrics reporting to separate function for simplicity

* eth/downloader/whitelist: check for fork correctness after chain validation

* eth/downloader/whitelist: small comment changes

* eth/downloader/whitelist: use checkpoint as well for fork correctness

* eth/downloader/whitelist: check already validated blocks

* eth/downloader/whitelist: consider last known valid block for calculating limit

* eth/downloader/whitelist: fix build errors

* eth/downloader/whitelist: parameterize max fork correctness limit

* eth/downloader/whitelist: add fork correctness tests

* eth/downloader/whitelist: remove debug logs

* eth/downloader/whitelist: cache whole fork instead of just first block, update tests

* eth/downloader/whitelist: fix potential uint64 underflow

* eth/downloader/whitelist: debug logs for better observability

* eth/downloader/whitelist: use built-in map clear function

* eth, internal/cli: add feature flag to disable blind fork validation

* fix flag name

* eth/downloader/whitelist: set empty size if flag is disabled

…pshot (#1765)

v2.2.11 to master

* remove minimum gas enforce while crearting accesslist

* unit tests

* ci fix

Backport master to develop

This commit fixes a bug where when heimdall is down, its status isn't correctly reflected in span store. The fix will make FetchStatus and GetLatestSpan non-blocking, which would allow the status of heimdall to be properly updated in span store.

…into develop-to-2.3.0