Add recursive watch

[0div]

Description

• users can now pass a onFileCreation listener via the Sandbox.create and Sandbox.connect methods.
• Handling of recursive nature of events and tests reflect changes in envd
• boyscouting: added a few cleanup functions that remove some created files during tests so that we don't have to restart envd to run subsequent tests

Tests

cd /packages/js-sdk
pnpm test

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Latest commit: 2902024

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