Add .git-blame-ignore-revs #5352
Description
Inspired by deephaven/web-client-ui#1431, deephaven-core could add a file that would automatically exclude certain commits from blame wrt GitHub, https://docs.github.com/en/repositories/working-with-files/using-files/viewing-a-file#ignore-commits-in-the-blame-view. It is based on the git-blame --ignore-rews-file feature. Locally, developers could configure git config blame.ignoreRevsFile .git-blame-ignore-revs to get the same results.
This would be useful for large / auto-generated commits. For example, formatting changes, header changes, etc.