chore: Add baseline for logging field validator

See merge request !433

Merged-by: Elliot Forbes <eforbes@gitlab.com>
Approved-by: Elliot Forbes <eforbes@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: Matias Alvarez <malvarez@gitlab.com>

feat(v2/featureflag): add optional LRU evaluation cache to Client

See merge request !399

Merged-by: Matias Alvarez <malvarez@gitlab.com>
Approved-by: Luke Hollinda <lhollinda@gitlab.com>
Approved-by: Doug Barrett <dbarrett@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Reviewed-by: Doug Barrett <dbarrett@gitlab.com>
Co-authored-by: e_forbes <eforbes@gitlab.com>