Allow regions to be locked

This is so awesome, and puts Layout Builder on closer parity with what WordPress can do with locking different parts of the Full Site Editor. I haven't tested this yet but will soon...

I've added the patch from @sonfd as a file here so it gets listed on top of the page

I want to review latest MR ASAP and deploy it in the new 2.0.x branch.

After that, we can create some RC releases with the feature.

Okay, I finally configured the environment for the running of the tests.

I found that LayoutBuilderLockTest::testLock() fell because of the missing $blockId parameter in LayoutBuilderLockTest::checkBlockRouteAccess() method.

It looks like in Drupal 8/9 there was a way to fetch it via a magic method:

$blockId = $blockId ?? $this->body_field_block_uuid;

Going to investigate previous commits to the LayoutBuilderLockTest class, and maybe will find something related.

Okay, finally I've fixed all the tests. The problem was with the body_field_block_uuid property, which was renamed in previous commits, but not updated in each place of code.

In addition, there were new style issues with the readme file. Disabled cspell checks for the maintainer's section.

Rewritten javascript of the module. Instead of jQuery, I used pure JS and removed outdated dependency core/jquery.

Merged into 2.x, going to create RC.
Thanks, everyone for your contribution.

Automatically closed - issue fixed for 2 weeks with no activity.