[10.x] Added whereTrue() and whereFalse() method to query builder

[troccoli]

This PR is in response to a pool I took: #46071 .

It's not uncommon to have boolean fields in tables, and querying for them is only possible with something like

$query->where('admin', true);

To make the code more readable, this PR adds two methods: whereTrue() and whereFalse(), plus the "or" versions. So now, the query above can be rewritten as

$query->whereTrue('admin');

The SQL created is

"admin" = true

which is valid in MySQL, PostgreSQL, SQLite and SQL Server

[milwad-dev]

#43088

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If possible, please consider releasing your code as a package so that the community can still take advantage of your contributions!

If you feel absolutely certain that this code corrects a bug in the framework, please "@" mention me in a follow-up comment with further explanation so that GitHub will send me a notification of your response.