feat: support json in Any driver

[JosiahParry]

Does your PR solve an issue?

Fixes: #3997

This PR adds implementations for Decode and Encode for Json<T> with support for Any.

Is this a breaking change?

No, this is not a breaking change. It adds new functionality only.

[abonander]

I'd love to land this feature, though unfortunately it's a little more complicated than it may have seemed initially.

[JosiahParry]

@abonander thank you for your feedback! I've gone ahead and made your suggested changes. However, when the thorough Postgres test suite starts there appears to be a syntax error or something similar.

My knowledge of postgres is fairly limited unfortunately.

---- it_encodes_decodes_json stdout ----
Error: error returned from database: syntax error at or near ")"
Caused by:
syntax error at or near ")"

The test uses the following queries:

    sqlx::query("create temporary table json_test (data TEXT)")
    sqlx::query("insert into json_test (data) values (?)")

should (?) be replaced with ($1)? Or do you suspect something different?

I'll look into spinning up my own postgres server for testing

[iamjpotts]

@abonander thank you for your feedback! I've gone ahead and made your suggested changes. However, when the thorough Postgres test suite starts there appears to be a syntax error or something similar.

My knowledge of postgres is fairly limited unfortunately.

---- it_encodes_decodes_json stdout ----
Error: error returned from database: syntax error at or near ")"
Caused by:
syntax error at or near ")"

The test uses the following queries:

    sqlx::query("create temporary table json_test (data TEXT)")
    sqlx::query("insert into json_test (data) values (?)")

should (?) be replaced with ($1)? Or do you suspect something different?

I'll look into spinning up my own postgres server for testing

That's likely fixed by using $x syntax instead of ? on postgres.

Here's an example from #3960:

    #[cfg(feature = "postgres")]
    const SQL: &str =
        "SELECT 'Hello, world!' as string where 'Hello, world!' in ($1, $2, $3, $4, $5, $6, $7)";

    #[cfg(not(feature = "postgres"))]
    const SQL: &str =
        "SELECT 'Hello, world!' as string where 'Hello, world!' in (?, ?, ?, ?, ?, ?, ?)";

[iamjpotts]

Was the Cargo.toml file reformatting intentional?

[JosiahParry]

Was the Cargo.toml file reformatting intentional?

@iamjpotts nope! Zed formatting my apologies. I'll revert.

[JosiahParry]

Reverted and showing no change! Thanks everyone for your help and patience:)