Arrange services in a per package sdk approach (#941)

## What changes are proposed in this pull request?

This PR moves all the service packages into separate packages and
isolates them from each other. It also removes the workspace and account
clients, which are replaced by the per-service clients.
Note: waiters and data plane services are removed and need to be enabled
again.
## How is this tested?

- Modified existing tests to use service clients instead of workspace
and account clients.
- Few tests are commented out, like tests involving waiters.
- WorkspaceClient, AccountClient Test creation tests are deleted.

NO_CHANGELOG=true

---------

Signed-off-by: Parth Bansal <[email protected]>

Author: parthban-db

.codegen.json

@@ -1,5 +1,5 @@
 {
-  "mode": "py_v0",
+  "mode": "py_mod",
   "api_changelog": true,  
   "version": {
     "databricks/sdk/version.py": "__version__ = \"$VERSION\""

.codegen/_openapi_sha

@@ -1 +1 @@
-94dc3e7289a19a90b167adf27316bd703a86f0eb
+e6971360e2752b3513d44a25d25f6cc5448056c8

.gitattributes

@@ -1,23 +1,80 @@
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