Consider renaming mogrify() to something else.

`mogrify()` is slang and not intuitive. Please consider renaming this to something more self-documenting like `execute_preview()` or `query_preview()` or `preview()`

"Returns the exact string that is sent to the database by calling the execute() method. "

https://github.com/aio-libs/aiomysql/blob/2eb8533d18b3a231231561a3ac881ce334f01312/aiomysql/cursors.py#L205

This is a useful helper, but right now it's nearly impossible to find without reading the code line-by-line.

Thanks!