API Improvement: impl IntoArguments for tuples to improve query_with

[aq-eng]

I would like to implement a smoother API for the functions query_with and query_as_with.

When using the query macro query! it is not necessary to call bind and the arguments to the database can be input directly:

let res = query!("SELECT * FROM mytable WHERE col_a = $1 AND col_b = $2", var_a, var_b).fetch_all(pool).await?;

But using the regular functions it is necessary to call bind multiple times:

let res = query("SELECT * FROM mytable WHERE col_a = $1 AND col_b = $2").bind(var_a).bind(var_b).fetch_all(pool).await?;

Instead I want to use the query_with function:

let res = query_with("SELECT * FROM mytable WHERE col_a = $1 AND col_b = $2", (var_a, var_b)).fetch_all(pool).await?;

The query_with function is public but the necessary trait

A: IntoArguments<'s, <AnyStatement<'q> as Statement<'q>>::Database>,

is hard to satisfy. I propose to impl IntoArguments for tuples of various sizes. This allows easy usage with query_with and query_as_with.

I could code and test the change but would need help or instructions using github. This is my first time on this platform.