Rename to Web Billing

[antoniobg]

Checklist

• If applicable, unit tests
• If applicable, create follow-up issues for purchases-ios and hybrids

Motivation

RevenueCat Billing product is being renamed to Web Billing

Description

• Rename "RevenueCat Billing"/"RC Billing" to "Web Billing" in a couple of places.
• Store enum remains unchanged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.11%. Comparing base (ac24f5d) to head (7c401b4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2094   +/-   ##
=======================================
  Coverage   81.11%   81.11%           
=======================================
  Files         271      271           
  Lines        8953     8953           
  Branches     1269     1269           
=======================================
  Hits         7262     7262           
  Misses       1162     1162           
  Partials      529      529           

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