fix(entity): infer selectId return type from adapter configuration

[timdeschryver]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] 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?

Closes #5073

The IdSelector always returned string | number.

What is the new behavior?

The return type if inferred by the adapter:

• uses the id property of the state
• uses the return type of the selectId method, if provided in the config options

Does this PR introduce a breaking change?

I'm also ok with flagging this as a breaking change.

[ ] Yes
[x] No

Other information

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