Add a tool for integration testing of a Github Action locally

Describe the enhancement
To test the correctness of an Action developers need permanently push their changes to GitHub that leads to:

• creating extra load on workers
• bloating repos
• having long feedback loop for developers
• the only possibility to write tests is creating special test workflows that is not convenient and doesn't allow to debug actions

As a author of many actions I faced this problem and created a library that allows:

• running actions locally (Windows, MacOS, Linux) or on any CI (including GitHub Actions itself)
• run JS (in the same or child process) and Docker actions
• passing test values as inputs, env vars, etc using nice TypeScript API (full support of Actions features)
• examine results of the Action run: outputs, exit code, issued commands in a manner familiar to any JS developer with their favorite testing tool

I suggest adding the library to the list of the tools. I believe that popularization of integration testing for GitHub Actions can improve the quality of Actions on the Marketplace and attract more developers to the Actions ecosystem.

Code Snippet
Test example:

import {RunOptions, RunTarget} from 'github-action-ts-run-api';

// RunTarget.preJsScript() and RunTarget.postJsScript() are also available
const target = RunTarget.mainJsScript('action.yml');
const options = RunOptions.create()
.setInputs({in1: 'abc'})
    .setEnv({ENV2: 'def'})
    .setState({my_state: 'ghi'});

const result = await target.run(options);

assert(result.durationMs >= 1000);
assert(result.commands.outputs === {out1: 'abc', out2: 'def'});
assert(result.commands.exportedVars === {v3: 'ghi'});
assert(result.exitCode === 1);
assert(result.warnings.length === 0);

Start with the proposed github-action-ts-run-api library and the action.yml entry point shown in the example. Confirm where the toolkit's list of tools is maintained and whether this project accepts a new integration-testing tool; done would be a reviewed addition with the library's purpose and usage documented.