Add since-latest-release script to match MetaMask/core

[Mrtenz]

This adds the since-latest-release script, which is a copy of the script in MetaMask/core. See MetaMask/core#1390 for more info.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.35%. Comparing base (c26555e) to head (6593a12).
Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #2744 +/- ##
=======================================
Coverage 94.35% 94.35% =======================================
Files 476 476 Lines 10138 10138 Branches 1542 1542 =======================================
Hits 9566 9566 Misses 572 572 

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