Support quickly testing php-wasm CLI changes with bun (#85)

## Motivation for the change, related issues

Testing Playground CLI with bun (via `npx nx dev playground-cli`) is
much faster than building and running via node (via `npx nx start
playground-cli`). This PR adds the option to run `@php-wasm/cli` the
same way.

## Implementation details

This PR adds a `dev` target to the php-wasm-cli project. The `dev`
target runs `@php-wasm/cli` using `bun --watch`.

## Testing Instructions (or ideally a Blueprint)

- CI
- Manually try the new target with `npx nx dev php-wasm-cli "-r 'echo
\"huzzah\n\";'"`
- Note: For some reason, extra args need to be quoted because they are
not escaped when forwarded, at least with our current version of nx and
nx:run-commands.

Author: brandonpayton

packages/php-wasm/cli/project.json

@@ -29,6 +29,13 @@
 				}
 			}
 		},
+		"dev": {
+			"executor": "nx:run-commands",
+			"options": {
+				"command": "bun --watch ./packages/php-wasm/cli/src/main.ts",
+				"tty": true
+			}
+		},
 		"start": {
 			"executor": "@wp-playground/nx-extensions:built-script",
 			"options": {