Log the time it takes to index the project

[rafeca]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
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  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

In order to understand better the real world performance of the fuzzy-finder and allow us to take better decisions, we want to start logging the time it takes to re-index a project (code pointer).

Some additional information that we want to log along the time:

• Number of files in the repository: the time will vary a lot depending on the project size so we need to be able to filter results by similar project sizes.
• is ripgrep enabled: Our hypothesis is that ripgrep will have an important impact on the indexing time, so we want to log if it's enabled to be able to compare results.

[rafeca]

This has already landed atom@master