feat!: add options when creating RawCommand

[benja-M-1]

What does this PR do?

This PR adds a second optional parameter to the testcontainers.NewRawCommand function to pass executable options to it.

Why is it important?

This allows any startup command to be ran with options like a different user, working directory and any available executable option.

For example:

testcontainers.Run(
	context.Background(),
	"rust:latest",
	tc.WithEntrypoint("tail"),
	tc.WithCmd("-f", "/dev/null"),
	tc.WithConfigModifier(func(c *container.Config) {
		c.WorkingDir = "/tmp"
	}),
	tc.WithStartupCommand(
		// This creates the /tmp/hello_world directory
		NewExecCommand([]string{"cargo", "new", "hello_world", "--vcs", "none"}),
		// This will add a dependency executing cargo from /tmp/hello_world
		NewExecCommand([]string{"cargo", "add", "rand"}, tcexec.WithWorkingDir("/tmp/hello_world")),
		NewExecCommand([]string{"cargo", "build"}, tcexec.WithWorkingDir("/tmp/hello_world")),
	),
	tc.WithWaitStrategy(wait.ForAll(
		wait.ForFile("/tmp/hello_world/target/debug/hello_world"),
	)),

Related issues

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[mdelapenya]

As we discussed, this is a very light BC, so I'm changing the title to feat!.

Other than that, LGTM, thanks for your time here!