add DEVSENSE.phptools-vscode extension

[jakubmisek]

I would like to suggest adding PHP Tools extension to the list of IDE plugins supporting Pest.

PHP Tools extension allows to do the following tasks form the VSCode's UI:

• Discover Pest tests and browse them in VSCode's Test Explorer window.
• Run Pest tests - either all, by suite, or by custom selection.
• Debug Pest test.
• Profile Pest test.
• Manage DataSets, and show failures with the test history for each of them separately.
• Allow to run a single data set.

Example screenshot: