This splits the backend into two parts: the local backend for desktop cellxgene and the AWS backend for hosted cellxgene. The local backend is in local_server while the hosted remains in server. The general idea is to copy everything from server to local_server, pull unneeded stuff out of local_server, and keep server as-is for this PR. Not touching server means all the infra and deployment code will continue working just as it did before so we can make those changes incrementally.
Add the `cellxgene schema apply` and `cellxgene schema validate` subcommands.
The first takes an h5ad file and a yaml with config information and produces a new h5ad that follows the cellxgene data integration schema.
The second takes an h5ad and checks if it follows the schema version written into its metadata.
Both are currently marked as "experimental" as the primary intended users are still at CZI.
* split out config
* add tests for base and app config, refactor client config out of app config
* refactor default config retrieval
* create config test class and helper functions
* move default_config into server to fix import issue
Marcus Kinsella