feat: Flag this/these not agreeing in number with the noun and/or verb

[hippietrail]

Description

This is a very common mistake for non-native English speakers whose native language does not have both a "short i" sound (like in "this") and a "long i" sound (like in "these")

Resources

• https://www.youtube.com/shorts/IEeMBG_aidI
• https://www.youtube.com/shorts/7F-PZUHpwyg
• https://youtu.be/1-wVmfAhq-o
• https://youtu.be/5jQdTpcBqXo
• (text descriptions of the mistake are surprisingly hard to find)

Examples

Found in the wild:

• This files is highly inspired from ...
  → This file is highly inspired from ...
  → These files are highly inspired from ...
• this is actually very serious issues
  → this is actually a very serious issue
  → these are actually very serious issues
• This companies have stocked goods in advance → These companies have ...