Handle relative paths in filesystem

[linear[bot]]

E2B-184 Improve filesystem handling in SDK+devbook - right now using "~" is not working

* Relative paths and aliases in paths aren’t supported * Examples: `~/index.js`, `./index.js`

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2d9d23b98433b22e9a9c24a70c0bc41d57067071

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | --------------- | ----- | | @e2b/python-sdk | Minor | | @e2b/sdk | Minor | | e2b-docs | Patch |

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