feat: expose helper to perform action and wait for update

[DylanPiercey]

Description

This PR exposes a helper called act which allows for an easy way to perform any mutation and wait for Marko components to update. It works similarly to await fireEvent helpers and the core implementation has been refactored for all of those helpers to use this underlying helper.

Motivation and Context

This makes it easy to do something like:

import { render, act } from "@marko/testing-library";

const { getByText } = await render(template);

await act(() => getByText("My Button").click());

or

import userEvent from "@testing-library/user-event";
import { render, act } from "@marko/testing-library";

const { getByDisplayValue } = await render(template);

await act(() => userEvent.type(getByDisplayValue("Hello"), " World"));

Checklist:

• [ ] I have updated/added documentation affected by my changes.
• [x] I have added tests to cover my changes.

[codecov[bot]]

Codecov Report

Merging #13 (4542a11) into main (e906526) will decrease coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   96.17%   96.07%   -0.10%     
==========================================
  Files           3        3              
  Lines         157      153       -4     
  Branches       39       37       -2     
==========================================
- Hits          151      147       -4     
  Misses          6        6              

Impacted Files	Coverage Δ
src/index-browser.ts	95.94% <100.00%> (ø)
src/index.ts	97.77% <100.00%> (ø)
src/shared.ts	94.11% <100.00%> (-0.62%)	:arrow_down:

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