[Woo POS] Modularization: Create PointOfSale module

[staskus]

Description

Continuation of #16148.

The goal of this PR is to finalize the changes:

1. ✅ Create PointOfSale module
2. ✅ Move all the POS files (except the Adaptors and TabBar)
3. Keep building and resolving remaining dependency errors until the PointOfSale module target succeeds
4. Then make required PointOfSale entities public so WooCommerce target would succeed. Mostly the dependencies for POSTabCoordinator that creates the entry point. import module PointOfSale
5. Once it succeeds, move WooCommerceTests to PointOfSaleTests, fix import issues, make sure tests succeed.
6. See if any adjustments required to run tests in CI
7. Modularization done

Steps to reproduce

Testing information

Screenshots

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

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[staskus]

@jaclync if you're interested, this could be a point of work, to continue and try finalizing the modularization.

Checking out this branch and seeing what is missing to make PointOfSale module build (see description). Hopefully, no more large dependencies need to be addressed to make the module build but hard to be sure.

[jaclync]

@staskus 👋 Just an update that I'm still in the middle of tackling build errors (Keep building and resolving remaining dependency errors until the PointOfSale module target succeeds step in this PR description). As you probably know, not all errors are shown at once but come up after fixing in batches 😅. I aim to fix all of them locally based on this branch first, then commit the changes for trunk in a separate PR. I plan to wrap up the changes on Monday, but due to the meetup, feel free to come back to it after the meetup.

[staskus]

@jaclync, thanks for the work and the update! I'm hopeful we're close to making it happen 🤞 Once the errors are tackled, the main work is done.