* implement "auto" database backend in client/db, in progress, #9201
* move fn supports_ref_counting from DatabaseSource enum to Database trait to make it work correctly for all types of dbs
* update kvdb_rocksdb to 0.13 and use it's new config feature to properly auto start existing database
* tests for auto database reopening
* introduce OpenDbError to cleanup opening database error handling and handle case when database is not enabled at the compile time
* cargo fmt strings again
* cargo fmt strings again
* rename DataSettingsSrc to fix test compilation
* fix the call to the new kvdb-rocksdb interdace in tests to fix compilation
* simplify OpenDbError and make it compile even when paritydb and rocksdb are disabled
* cargo fmt
* fix compilation without flag with-parity-db
* fix unused var compilation warning
* support different paths for rocksdb and paritydb in DatabaseSouce::Auto
* support "auto" database option in substrate cli
* enable Lz4 compression for some of the parity-db colums as per review suggestion
* applied review suggestions