Git utilities

[AlexAxthelm]

Another PR towards the manifest export

this one adds utilities for identifying git status on a directory, and surfacing any changes from upstream or local HEAD (dirty repo).

Notable updates:

• adds get_git_info which returns a list with git info about a repo specified
• Adds a call to get_git_info to get_individual_package_info for packages installed from local directory or loaded with devtools/pkgload

[codecov]

Codecov Report

Attention: Patch coverage is 94.81481% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 90.13%. Comparing base (eecbd85) to head (c951bc9).

❗ Current head c951bc9 differs from pull request most recent head 0a2889a. Consider uploading reports for the commit 0a2889a to get more accurate results

Files	Patch %	Lines
R/git.R	93.85%	7 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##           feat/1-export-manifests       #9      +/-   ##
===========================================================
+ Coverage                    86.41%   90.13%   +3.71%     
===========================================================
  Files                            4        5       +1     
  Lines                          162      294     +132     
===========================================================
+ Hits                           140      265     +125     
- Misses                          22       29       +7     

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[jdhoffa]

A couple NB comments/ questions, but LGTM and functions well locally.

Very cool PR in general :-)

[jdhoffa]

Related: I know this package is meant to be "minimal" but probably a good idea to explain that it's for tests in a separate repo, so that we don't accidentally delete it. See RMI-PACTA/minimal.r.package#1