Use tsx to run the tool locally instead of ts-node

[mcmire]

Following 718b9c0c14ba6319ddf6a4db4d55040e995f41ae, running yarn run-tool now produces an error:

import { DEFAULT_PROJECT_NAMES, DEFAULT_CACHED_REPOSITORIES_DIRECTORY_PATH } from './constants';
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at internalCompileFunction (node:internal/vm:73:18)
    at wrapSafe (node:internal/modules/cjs/loader:1153:20)
    at Module._compile (node:internal/modules/cjs/loader:1205:27)
    at Module.m._compile (/Users/elliot/code/metamask/module-lint/node_modules/ts-node/src/index.ts:1455:23)
    at Module._extensions..js (node:internal/modules/cjs/loader:1295:10)
    at Object.require.extensions.<computed> [as .ts] (/Users/elliot/code/metamask/module-lint/node_modules/ts-node/src/index.ts:1458:12)
    at Module.load (node:internal/modules/cjs/loader:1091:32)
    at Function.Module._load (node:internal/modules/cjs/loader:938:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:83:12)
    at phase4 (/Users/elliot/code/metamask/module-lint/node_modules/ts-node/src/bin.ts:567:12)

It's unclear why this happens, but tsx is faster than ts-node and is a lot less hassle to use.