feat(signals): add patchState function and remove $update method

[markostanimirovic]

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?

[ ] Bugfix
[x] 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?

Signal state is updated by using the $update method:

import { signalState } from '@ngrx/signals';

const usersState = signalState({
  firstName: 'Marko',
  lastName: 'Stanimirovic',
});

usersState.$update({ firstName: 'Brandon' });

What is the new behavior?

Signal state is updated by using the patch function:

import { patchState, signalState } from '@ngrx/signals';

const usersState = signalState({
  firstName: 'Marko',
  lastName: 'Stanimirovic',
});

patchState(usersState, { firstName: 'Brandon' });

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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[timdeschryver]

I like this!

[brandonroberts]

🤘🏿