chore: Add early support for FDv2-based test data source#350

keelerm84 merged 4 commits intomainlaunchdarkly/python-server-sdk:mainfrom

mk/sdk-1445/fdv2-test-data-sourcelaunchdarkly/python-server-sdk:mk/sdk-1445/fdv2-test-data-sourceCopy head branch name to clipboard