[WIP] Add opened examples to Open Recent menu

[francescospissu]

Motivation

Currently when an example sketch is opened it is not added to the Open Recent menu.

Change description

A temporary sketch can be added to the Open Recent menu if it doesn't include the string sketch_ in the name.

Other information

Closes #935.

Different solutions have been investigated to solve this problem, including:

• Remove the return if a sketch is temporary in the markAsRecentlyOpened function
  

  arduino-ide/arduino-ide-extension/src/node/sketches-service-impl.ts

  Lines 280 to 281 in 5cb9166

  	if (await this.isTemp(sketch)) {
  	return;

  
  Solution discarded because in this way also a new sketch created from File -> New is added to the recents.

• Change the parentPath of the new opened example without the creation of a temporary folder in the cloneExample function
  

  arduino-ide/arduino-ide-extension/src/node/sketches-service-impl.ts

  Line 339 in 5cb9166

  const parentPath = await this.createTempFolder();

  
  Solution discarded because the example is added directly to the sketchbook without saving it previously.

The current solution is not yet valid because a better way must be found to prevent an example from being considered a "standard" temporary file.

Reviewer checklist

• PR addresses a single concern.
• The PR has no duplicates (please search among the Pull Requests before creating one)
• PR title and description are properly filled.
• Docs have been added / updated (for bug fixes / features)