feat: add CrateDB module

[surister]

Solves #198

cc @kneth

[mervyn-mccreight]

Thanks for your contribution 🚀
Can you please check the formatting plus the clippy errors?

[mervyn-mccreight]

Seems like rustfmt is still failing

[CommanderStorm]

Hi, sorry for the late reviews.

I usually would not review so late in the cycle, but I think the docs currently would not work as you intended.

[CommanderStorm]

Suggested change

	/// super_user: crate
	/// password: <empty>
	/// pg_port: 5432
	/// http_port: 4200
	/// - `super_user`: `crate`
	/// - `password`: <empty>
	/// - `pg_port`: `5432`
	/// - `http_port`: `4200`

[CommanderStorm]

currently, this is not a doctest

Suggested change

	/// use testcontainers_modules::{postgres, testcontainers::runners::SyncRunner};
	///
	/// let postgres_instance = cratedb::CrateDB::default().start().unwrap();
	///
	/// let connection_string = format!(
	/// "postgres://crate@{}:{}/postgres",
	/// postgres_instance.get_host().unwrap(),
	/// postgres_instance.get_host_port_ipv4(5432).unwrap()
	/// );
	///
	/// let mut conn = postgres::Client::connect(connection_string, postgres::NoTls).unwrap();
	/// let rows = conn.query("SELECT 1 + 1", &[]).unwrap();
	/// ```
	/// use testcontainers_modules::{postgres, testcontainers::runners::SyncRunner};
	///
	/// let postgres_instance = cratedb::CrateDB::default().start().unwrap();
	///
	/// let connection_string = format!(
	/// "postgres://crate@{}:{}/postgres",
	/// postgres_instance.get_host().unwrap(),
	/// postgres_instance.get_host_port_ipv4(5432).unwrap()
	/// );
	///
	/// let mut conn = postgres::Client::connect(connection_string, postgres::NoTls).unwrap();
	/// let rows = conn.query("SELECT 1 + 1", &[]).unwrap();
	/// # assert_eq!(rows.len(), 1);
	/// ```

[CommanderStorm]

Suggested change

	/// Sets CrateDB's heap size, only increase it if you are testing big high volumes of data.
	/// Sets CrateDB's heap size
	///
	/// You may need to increase this if you are testing high volumes of data.

[CommanderStorm]

This is never set to anything other than Vec::new... Is this intentional?

[CommanderStorm]

This fixes the linting issue raised by rustfmt

Suggested change

	use super::*;
	use testcontainers::{runners::SyncRunner, ImageExt};
	#[test]
	use super::*;
	use crate::testcontainers::{runners::SyncRunner, ImageExt};
	#[test]