Replace ember-template-imports with content-tag

[gitKrystan]

Resources

https://github.com/embroider-build/content-tag
https://github.com/ember-template-imports/ember-template-imports/releases/tag/v4.0.0

Considerations

It's likely that updating to content-tag here will break compatibility with prettier-plugin-ember-template-tag and vice versa. See notes here: ember-tooling/prettier-plugin-ember-template-tag#149

[patricklx]

Hi, thats why there is work on #1942
Where no more changes on prettier plugin are needed as it will receive the original source code.
Actually, just waiting for merge and major release

[gitKrystan]

Where no more changes on prettier plugin are needed as it will receive the original source code.

Thanks for the heads up! This will be a big help.