feat(Data Mapper): Display DM V2 for VsCode with Internal Setting

[Elaina-Lee]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Feature for vs-code data mapper
• What is the current behavior? (You can also link to an open issue here)
  Always displays Data Mapper v1
• What is the new behavior (if this is a feature change)?
  Vs code internal setting to configure for v2 (beta) with default value of v1
  Displays Data Mapper V1/V2 depending on the internal setting
• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  no
• Please Include Screenshots or Videos of the intended change:

DMV2VsCode.after.mp4

[Elaina-Lee]

• Having further discussion off-line about turning vs-code setting to be hidden from regular users