* l2geth: add Backend enums and config parsing

* l2geth: move OVMContext to types file

* l2geth: implement syncservice spec

* l2geth: fix error handling for get tx batch

* l2geth: update tests to compile and pass

* l2geth: add sync range functions

* l2geth: add batch index indexing

* l2geth: update syncservice hot path logging

* l2geth: use indexed batch index

* chore: add changeset

* l2geth: sync spec refactor (#822)

* l2geth: more in depth usage string

* l2geth: add standard client getters for index

* l2geth: refactor sync service into shared codepaths

* l2geth: clean up tests

* l2geth: better logging and error handling

* test: improve test coverage around timestamps

* l2geth: improve docstring

* l2geth: rename variable

* sync-service: better logline

* l2geth: better logline

* l2geth: test apply indexed transaction

* l2geth: better logline

* linting: fix

* syncservice: fix logline

* l2geth: add error and fix logline

* l2geth: sync service tests

* fix: get last confirmed enqueue (#846)

* l2geth: fix get last confirmed enqueue

* chore: add changeset

* client: return error correctly

* batch-submitter: updated config (#847)

* batch-submitter: backwards compatible configuration

* chore: add changeset

* deps: update

* js: move bcfg interface to core-utils

* batch-submitter: parse USE_SENTRY and add to env example

* chore: add changeset

* batch-submitter: parse as float instead of int

* batch-submitter: better error logging

* l2geth: update rawdb logline
Co-authored-by: Georgios Konstantopoulos <me@gakonst.com>

* l2geth: more robust testing
Co-authored-by: Georgios Konstantopoulos <me@gakonst.com>

* l2geth: add sanity check for L1ToL2 timestamps

* l2geth: handle error in single place

* l2geth: fix test tx queue origin

* l2geth: add new arg to start.sh

* l2geth: return error in the SyncService.Start()

* chore: go fmt
Co-authored-by: Georgios Konstantopoulos <me@gakonst.com>