Upgrade to Yarn v3, Nx 13.1.4, and move to @nrwl/nx-plugin proper structure

[benpsnyder]

There were issues with running normal CLI upgrade commands, so I had to use the following: npx @nrwl/tao@latest migrate @nrwl/workspace@13.1.4 @nrwl/angular@13.1.4 --from="@nrwl/workspace@11.0.0"

Upgrading to Yarn v3 based on lessons learned from:

• Switch to Yarn v3 as the package manager default
• feat(core): upgrade yarn v1 => v3 [berry] && replace npx with yarn dlx

Reorganized files based on: npx create-nx-plugin @angular-architects --pluginName ddd

[benpsnyder]

@manfredsteyer @peterbsmyth this is ready to go.

[jon9090]

@benpsnyder @PetarKirov this PR is important. when it will merge and release?

[benpsnyder]

@manfredsteyer I would be willing to maintain and release consistently if you authorize.