Add external catalogs to catalogs tree

[osipovartem]

Schema providers cache

• if the schema is missing in the cache then fetch it from the original catalog and add to cache
• register table in cache and pass to original SchemaProvider implementation if supported
• deregister table from cache and pass to original SchemaProvider implementation if supported
  Tables provider cache
• add table schema to the cache if possible

Query logical plan execution

• removed logic to get all tables from catalogs since we already added them during session creation_

UI handlers

• Navigation tree fetched from session catalogs (select from information schema triggers heavy tables scan, but we need only table names, this logic be updated in the next PR)
• Table schema fetching not changed
• Table data preview
  • removed metastore existence check for tables since we added external catalogs and engine should check this by himself
  • removed StringArray downcasting since we should use array_value_to_string we wide support of data types

Related to #560 and #699

[DanCodedThis]

Otherwise LGTM