util/scripts: Add a script to find new users' commits on gerrit

This script lists all new commits from users with few merged commits.
By default, it looks at the last week, and considers anyone with fewer
than 5 commits merged to be a new user.

Currently the only command line argument that's accepted is the gerrit
username of the person running the query. To modify any of the other
options, the values hard-coded into the script need to be updated.

To keep down the number of repeated queries, the script saves lists of
users considered to be experienced, as well as the commits from new
users that it lists.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ic698798f3fddc77900c8c4e6f8427991bda3f2d1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78184
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nicholas Chin <nic.c3.14@gmail.com>

util/scripts/description.md

@@ -7,6 +7,7 @@ __scripts__
                       various human readable formats. `Bash`
   * _dts-to-fmd.sh_ -Converts a depthcharge fmap.dts into an fmaptool
                      compatible .fmd format `Bash`
+  * _find_new_user_commits.sh_ - Finds new gerrit committers `Bash`
   * _find-unused-kconfig-symbols.sh_ - Points out Kconfig variables
                                        that may be unused. There are
                                        some false positives, but it