[11.x] Add length to binary method

[hafezdivandari]

This PR adds support for binary(n) and varbinary(n) column types on databases that support this type (MySQL, MariaDB and SQL Server).

PS: No upgrade guide entry is needed.

Usage

Schema::binary('test', function (Blueprint $table) {
    $table->binary('blob_column'); // no change
    // `BLOB` on MySQL, MariaDB, and SQLite, `BYTEA` on PostgreSQL, `VARBINARY(MAX)` on SQL Server

    $table->binary('varbinary_column', length: 16);
    // `VARBINARY(16)` on MySQL, MariaDB, and SQL Server, `BLOB` on SQLite, `BYTEA` on PostgreSQL

    $table->binary('binary_column', length: 16, fixed: true);
    // `BINARY(16)` on MySQL, MariaDB, and SQL Server, `BLOB` on SQLite, `BYTEA` on PostgreSQL
});

Syntax	MySQL / MariaDB	SQL Server	SQLite	PostgreSQL
binary('name')	BLOB	VARBINARY(MAX)	BLOB	BYTEA
binary('name', length: 16)	VARBINARY(16)	VARBINARY(16)	BLOB	BYTEA
binary('name', length: 16, fixed: true)	BINARY(16)	BINARY(16)	BLOB	BYTEA