refactor(signals, with-collection-service): Update key names

[Johanneslueke]

replace "signals" key with "computed" key to be type compatible wit the latest ngrx release

SignalStoreFeature<{ state: ... , signals: ... , // old name methods: ... }>

SignalStoreFeature<{ state: ... , computed: ... , // <--!!! new name methods: ... }>

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/voznik/ngx-odm/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

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

What is the current behavior?

with the latest release of ngrx the withCollectionService method is type incompatible with the the ngrx "signalStore".

Issue Number: N/A

What is the new behavior?

the "withCollectionService" becomes compatible with the "signalStore" method

Does this PR introduce a breaking change?

[ ] Yes
[ x ] No

Other information

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

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