Ability to manually enter a path to interpreter in the select interpreter dropdown

[DonJayamanne]

From @DonJayamanne on November 7, 2017 23:43

Suggestion, add a + symbol on the top of the list as is done with Branches to either select an existing interpreter (file picker) or create one....

Copied from original issue: DonJayamanne/pythonVSCode#1375

[brettcannon]

To help manage our issues and to better communicate what the team plans to work on we are closing issues that we don't plan to work on but would accept a pull request from a volunteer for. To be clear, closing this issue does not mean we won't consider a pull request for this enhancement as outlined in our contributing guide, just that the development team has no plans to work on it themselves.

[karrtikr]

Clicking on “Enter interpreter path...” would display the following options:

This way users would be allowed to type in the path to their Python interpreter, or browse their file system to find and select it.

[karrtikr]

Partially blocked on feature request microsoft/vscode#95123

[karrtikr]

window.showOpenDialog should do the job here.