Support smart selection for Markdown table

Future request

Some smart select in markdown is supported in https://github.com/microsoft/vscode/issues/107410. However, markdown table is not supported in this issue.

In Markdown table, it would be nice to be able to select each cell with smart select.

Current situation

Demonstrate using the table below.

| Contents  | Description         |
| :-------: | :------------------ |
|  Fruits   | Sweet and delicious |
| Vegetable | Nutritious          |
|   Meat    | Source of power     |

• Select cell of 2-1 with smart selection (Shift+Alt+Right one time)

  

• Select cell of 3-2 with smart selection (Shift+Alt+Right three times and Shift+Alt+Left three times)

  

Expected behavior

• Select cell of 2-1 with smart selection

  

• Select cell of 3-2 with smart selection

  

Version

• Stable

   Version: 1.69.0 (user setup)
    Commit: 92d25e35d9bf1a6b16f7d0758f25d48ace11e5b9
      Date: 2022-07-07T05:28:36.503Z
  Electron: 18.3.5
  Chromium: 100.0.4896.160
   Node.js: 16.13.2
        V8: 10.0.139.17-electron.0
        OS: Windows_NT x64 10.0.22000
  

• Insider

   Version: 1.70.0-insider (user setup)
    Commit: 3104db414c8fedcf6e4493f14da7df0b7413853a
      Date: 2022-07-08T05:20:13.606Z
  Electron: 18.3.5
  Chromium: 100.0.4896.160
   Node.js: 16.13.2
        V8: 10.0.139.17-electron.0
        OS: Windows_NT x64 10.0.22000