Replace p-debounce by lodash.debounce

[smart-bo]

What it does

Fixes eclipse-theia#9139

We used more two libs for debouncing: p-debounce and lodash.debounce,
Since lodash.debounce is used more than p-debounce , we replace p-debounce by lodash.debounce where it used before.

As lodash.debounce return undefine where our API ask for a promise type, we have to write a debounceAsync function to wrap lodash.debounce and return an ideal type.
This function is located at @theia/core/lib/common/promise-util. Other files where is needed import it.

How to test

Some of the functions which use debounce are difficult to test.
it would be better to test the debounceAsync function in a test file,
or in files like theia\packages\debug\src\browser\debug-configuration-manager.ts / theia\packages\core\src\browser\preferences\preference-provider.ts.
The latters run with the start of the application. so we can test that firing the preference is now properly debounced, and will not fire too many times for the same event loop.

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