feat: file upload

[mariosimao]

Closes #406

[codecov]

Codecov Report

❌ Patch coverage is 9.55056% with 161 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.16%. Comparing base (7b0d157) to head (81f6f2b).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/FileUploads/Client.php	0.00%	128 Missing ⚠️
src/FileUploads/FileUpload.php	0.00%	17 Missing ⚠️
src/Exceptions/FileUploadException.php	0.00%	12 Missing ⚠️
src/Notion.php	0.00%	2 Missing ⚠️
src/Blocks/Renderer/Markdown/FileRenderer.php	50.00%	1 Missing ⚠️
src/Blocks/Renderer/Markdown/PdfRenderer.php	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #412      +/-   ##
============================================
- Coverage     97.71%   94.16%   -3.56%     
- Complexity     1390     1440      +50     
============================================
  Files           162      166       +4     
  Lines          4813     4761      -52     
============================================
- Hits           4703     4483     -220     
- Misses          110      278     +168     

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