feat!: remove ng modules

[NachoVazquez]

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• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

NgModules are deprecated but they are still part of the library

What is the new behavior?

We have completely removed the NgModules from the source code.

Does this PR introduce a breaking change?

[x] Yes
[ ] No

NgModules can not be used anymore to configure the library, only provider functions can be used now.

[nx-cloud]

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Quality Gate passed

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