Add "I posted a review" checkbox to "Issue comment" template and a fourth category (reviews)

Problem/Motivation

While the credit checkboxes have improved things a lot already in properly giving credit, there is still the issue that on average posting an even unrelated or out-of-scope patch to an issue will get review credit, while a long and thorough "Architecture / Code / DX / UX / AX / Design / Performance / ..." review that took several hours to create might not.

Core committers and project maintainers have improved on that, but it is still not possible to say "I deserve commit credit for this." besides nagging or writing proposed commit messages, which is all not what the goal of the improved commit credit widget was.

To sum it up in a Quote:

A lot of people don't review because review != credit, they could jump in with a 5 second reroll and get that :D.

Proposed resolution

- Add a special "I posted a review (Code / UX / AX / DX / TX / Design / Architecture / Performance / ... )" checkbox and count it like patch files.

Yes, it is possible to abuse it, but:

a) Commit credit can still be taken if someone is found abusive.
b) It is already possible to "game" the system with uploading images, unrelated changes, 5 min re-rolls, etc.

This will hopefully motivate more people on giving good reviews and it will ensure that if someone worked on e.g. performance profiling for days or re-reviewed a patch again and again, they will get the commit credit.

Remaining tasks

- Do it.

User interface changes

- Added a new checkbox and a new column.

API changes

- None (as far as I can see).