feat(signals): rename rxMethod.unsubscribe to destroy

[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)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the new behavior?

The unsubscribe method from rxMethod is renamed to destroy.

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

The `unsubscribe` method from `rxMethod` is renamed to `destroy`.

BEFORE:

const logNumber = rxMethod<number>(tap(console.log));

const num1Ref = logNumber(interval(1_000));
const num2Ref = logNumber(interval(2_000));

// destroy `num1Ref` after 2 seconds
setTimeout(() => num1Ref.unsubscribe(), 2_000);

// destroy all reactive method refs after 5 seconds
setTimeout(() => logNumber.unsubscribe(), 5_000);

AFTER:

const logNumber = rxMethod<number>(tap(console.log));

const num1Ref = logNumber(interval(1_000));
const num2Ref = logNumber(interval(2_000));

// destroy `num1Ref` after 2 seconds
setTimeout(() => num1Ref.destroy(), 2_000);

// destroy all reactive method refs after 5 seconds
setTimeout(() => logNumber.destroy(), 5_000);

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