Integration for configuring workspace bindings

[willwwt]

Add get_workspace_bindings and update_workspace_bindings CLI for workspace bindings configuration.

Manual test:

(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ databricks --profile e2-weitao unity-catalog catalogs
Usage: databricks unity-catalog catalogs [OPTIONS] COMMAND [ARGS]...

Options:
  -h, --help  Show this message and exit.

Commands:
  create           Create a new catalog.
  delete           Delete a catalog.
  get              Get a catalog.
  get-bindings     Get workspace bindings of a catalog.
  list             List catalogs.
  update           Update a catalog.
  update-bindings  Update workspace bindings of a catalog.

(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ databricks unity-catalog catalogs update-bindings --name weitao-catalog --json-file update-bindings.json --profile e2-weitao
{
  "workspaces": [
    6051921418418893
  ]
}
(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ databricks --profile e2-weitao unity-catalog catalogs get-bindings --name weitao-catalog
{
  "workspaces": [
    6051921418418893
  ]
}
(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ cat update-bindings.json
{
    "assign_workspaces": [6051921418418893]
}
(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ vi update-bindings.json
(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ databricks unity-catalog catalogs update-bindings --name weitao-catalog --json-file update-bindings.json --profile e2-weitao
{}
(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ cat update-bindings.json
{
    "unassign_workspaces": [6051921418418893]
}
(venv2.7) Q7Q6DF6LLJ:databricks-cli Weitao.Wen$ databricks --profile e2-weitao unity-catalog catalogs get-bindings --name weitao-catalog
{}

[adamcain-db]

Additions LGTM. @willwwt said he'd add unit tests.

[willwwt]

Additions LGTM. @willwwt said he'd add unit tests.

Added unit tests in tests/unity_catalog/test_catalog_cli.py

[adamcain-db]

LGTM

[yeshengm]

LGTM