[1.x] Better Support for RTL

[joelbutcher]

Refactoring PR to align RTL support with Jetstream, following the merge of laravel/jetstream#1392.

Similar to the PR to Jetstream, these changes have been applied:

• Replace ml-x with ms-x and mr-x with me-x
• Replace pl-x with ps-x and pr-x with pe-x
• Replace text-left with text-start and text-right with text-end
• Replace left-0 with start-0 and right-0 with end-0
• Apply ltr: and rtl: modifiers for the dropdown components (.e.g ltr:origin-top-left rtl:origin-top-right)

Testing
I've tested each stack locally by adding the dir="rtl" attribute to the body element in both the guest and app layouts. Content appears to align correctly in these formats.