[DataGridPro] Server-side tree data support

[MBilalShafi]

Part of #8179
Resolves #3377

Previews:
Server side tree data with server-side indexed pagination, sorting, filtering, and caching: https://deploy-preview-12317--material-ui-x.netlify.app/x/react-data-grid/server-side-data/tree-data/
Plain data server-side pagination, filtering, and sorting: https://deploy-preview-12317--material-ui-x.netlify.app/x/react-data-grid/server-side-data/#usage

Action items:

• A basic data source implementation via a dedicated hook
• New strategy processor for server-side tree data
• Allow use of the cache with the data source
• Make pagination.rowCount a controlled state (extracted to [DataGrid] Make rowCount part of the state #12381)
• Support x-data-generator to provide server-side filtered and sorted data (mock an actual data source) => (useMockServer)
• Support server-side sorting, filtering, and (index-based) pagination.
• Make rows an optional prop (extracted to [DataGrid] Make rows an optional prop #12478)
• Support imperative operations on the data source cache
• Add a default internal cache
• Support unknown and estimated rowCount (extracted to [DataGrid] Support advanced server-side pagination use cases #12474)
• Support defaultGroupingExpansionDepth and isGroupExpandedByDefault
• Demos
  • Error handling (plain data)
  • Error handling (tree data)
  • Custom cache on plain data
  • Demos with swr and react-query
• Discoverability: Make the demos closer to the actual code to make it easy to copy-paste
• Perf: Optimize the rowTreeCreation and other processes of rows pre-processing
• Revisit naming conventions (e.g. DataSource vs DataManager vs DataProvider vs ?)

Follow-up Items (for subsequent PRs):

• Test coverage: [DataGrid] Improve test coverage of server side data source #15942
• Publish API events to support advanced use-cases
• Tree data: Support filter/sort on Group column
• Cursor-based pagination demo
• Unknown/estimated row count demo
• Request cancellation support demo
• [DataGrid] Consider bringing back the error overlay #11399
• Make loading a controlled prop ?
• Custom cache demo ([DataGridPro] Server-side tree data support #12317 (comment))

[mui-bot]

Deploy preview: https://deploy-preview-12317--material-ui-x.netlify.app/

Updated pages:

• docs/data/data-grid/server-side-data/index.md
• docs/data/data-grid/server-side-data/tree-data.md
• docs/data/data-grid/tree-data/tree-data.md

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