feat(upload): merge upload related API from @nextcloud/upload

[susnux]

As it was decided to move UI to the vue library it is easier to move the pure API to this library.
Reducing libraries to maintain and also it fits nicely into this libraries scope.

[codecov]

Codecov Report

❌ Patch coverage is 36.81592% with 254 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.47%. Comparing base (9baccb0) to head (2ba1041).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/upload/uploader/UploadFileTree.ts	0.00%	73 Missing ⚠️
lib/upload/uploader/Uploader.ts	15.66%	69 Missing and 1 partial ⚠️
lib/upload/utils/fileTree.ts	0.00%	38 Missing ⚠️
lib/upload/uploader/UploadFile.ts	60.52%	26 Missing and 4 partials ⚠️
lib/upload/utils/upload.ts	12.12%	29 Missing ⚠️
lib/upload/utils/config.ts	38.46%	6 Missing and 2 partials ⚠️
lib/upload/utils/filesystem.ts	0.00%	3 Missing ⚠️
lib/upload/uploader/Upload.ts	60.00%	2 Missing ⚠️
lib/upload/uploader/Eta.ts	98.41%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1509       +/-   ##
===========================================
- Coverage   86.14%   67.47%   -18.67%     
===========================================
  Files          30       43       +13     
  Lines         664     1070      +406     
  Branches      194      269       +75     
===========================================
+ Hits          572      722      +150     
- Misses         80      326      +246     
- Partials       12       22       +10     

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