Introduce S4H PDF upload

[jannis-baum]

Close #446

Problem

The D4L SDK depends on an older version of tink (1.2, but up to 1.4 in testing) while flutter_secure_storage depends on 1.5. This causes problems, so we use a dummy key until someone figures out what to do

See lib/common/utilities/hive_utils.dart

[codecov]

Codecov Report

Base: 72.96% // Head: 70.83% // Decreases project coverage by -2.12% ⚠️

Coverage data is based on head (41fc2a2) compared to base (881bdc4).
Patch coverage: 17.17% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
- Coverage   72.96%   70.83%   -2.13%     
==========================================
  Files         101      102       +1     
  Lines        2234     2318      +84     
  Branches       95       95              
==========================================
+ Hits         1630     1642      +12     
- Misses        604      676      +72     

Flag	Coverage Δ
app	53.81% <17.17%> (-2.60%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
app/lib/common/models/medication/guideline.dart	11.11% <0.00%> (ø)
app/lib/common/models/medication/medication.dart	4.54% <0.00%> (ø)
app/lib/common/utilities/hive_utils.dart	0.00% <0.00%> (ø)
app/lib/common/utilities/pdf_utils.dart	0.00% <0.00%> (ø)
app/lib/reports/pages/cubit.dart	0.00% <ø> (ø)
app/lib/settings/chdp_state.dart	0.00% <0.00%> (ø)
app/lib/common/pages/medications/medication.dart	56.09% <22.22%> (-39.15%)	⬇️
app/lib/settings/pages/settings.dart	92.72% <87.50%> (-1.03%)	⬇️

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