[#25] Integrates task and backend service, merges document alignment OCR code

[lancelafontaine]

[#25]

• [x] Integrates task and backend service by using multipart/form-data
• [x] Merges document detection and code

[codecov[bot]]

Codecov Report

Merging #365 into master will decrease coverage by 1.53%. The diff coverage is 50%.

@@            Coverage Diff            @@
##           master    #365      +/-   ##
=========================================
- Coverage   68.63%   67.1%   -1.54%     
=========================================
  Files          52      53       +1     
  Lines        2063    2128      +65     
  Branches       16      16              
=========================================
+ Hits         1416    1428      +12     
- Misses        645     698      +53     
  Partials        2       2

Impacted Files	Coverage Δ
src/backend_service/services/task_service.py	50% <50%> (ø)
...end_service/controllers/conversation_controller.py	55.37% <50%> (-0.47%)	:arrow_down:
controllers/ocr_controller.py	32.91% <0%> (-52.09%)	:arrow_down:
app.py	0% <0%> (ø)	:arrow_up:

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