graph, store: Make RowGroup.rows private

wip

add comments to clarify intent when ignoring useless substreams messages

Merge branch 'master' into stepd/substreams_undo_rework

bump substreams client to sf.substreams.rpc.v2.Stream/Blocks

This breaks compatibility with previous substreams servers that only
support 'sf.substreams.v1.Stream/Blocks'

build(deps): bump indexmap from 1.9.2 to 1.9.3 (graphprotocol#4499)

Bumps [indexmap](https://github.com/bluss/indexmap) from 1.9.2 to 1.9.3.
- [Release notes](https://github.com/bluss/indexmap/releases)
- [Changelog](https://github.com/bluss/indexmap/blob/master/RELEASES.md)
- [Commits](indexmap-rs/indexmap@1.9.2...1.9.3)

---
updated-dependencies:
- dependency-name: indexmap
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

store: Add some stopwatch sections

cosmos: use default impl of CheapClone (graphprotocol#4426)

build(deps): bump prost-types from 0.11.6 to 0.11.8 (graphprotocol#4404)

Bumps [prost-types](https://github.com/tokio-rs/prost) from 0.11.6 to 0.11.8.
- [Release notes](https://github.com/tokio-rs/prost/releases)
- [Commits](tokio-rs/prost@v0.11.6...v0.11.8)

---
updated-dependencies:
- dependency-name: prost-types
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Release v0.30.0