feat(signals): add `withProps` base feature

[markostanimirovic]

PR Checklist

Please check if your PR fulfills the following requirements:

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

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?

Closes #4504

What is the new behavior?

• The computed property in SignalStoreFeatureResult type is renamed to props.
• The EntityComputed and NamedEntityComputed types in the entities plugin are renamed to EntityProps and NamedEntityProps.

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

- The `computed` property in `SignalStoreFeatureResult` type is renamed to `props`.
- The `EntityComputed` and `NamedEntityComputed` types in the `entities` plugin are renamed to `EntityProps` and `NamedEntityProps`.

BEFORE:

import { computed, Signal } from '@angular/core';
import {
  signalStoreFeature,
  SignalStoreFeature,
  type,
  withComputed,
} from '@ngrx/signals';
import { EntityComputed } from '@ngrx/signals/entities';

export function withTotalEntities<Entity>(): SignalStoreFeature
  { state: {}, computed: EntityComputed<Entity>, methods: {} },
  { state: {}, computed: { total: Signal<number> }, methods: {} },
> {
  return signalStoreFeature(
    { computed: type<EntityComputed<Entity>>() },
    withComputed(({ entities }) => ({
      total: computed(() => entities().length),
    })),
  );
}

AFTER:

import { computed, Signal } from '@angular/core';
import {
  signalStoreFeature,
  SignalStoreFeature,
  type,
  withComputed,
} from '@ngrx/signals';
import { EntityProps } from '@ngrx/signals/entities';

export function withTotalEntities<Entity>(): SignalStoreFeature
  { state: {}, props: EntityProps<Entity>, methods: {} },
  { state: {}, props: { total: Signal<number> }, methods: {} },
> {
  return signalStoreFeature(
    { props: type<EntityProps<Entity>>() },
    withComputed(({ entities }) => ({
      total: computed(() => entities().length),
    })),
  );
}

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