feat: Add functionality to search for notes

[JonaFleischmann]

Hi, I added the functionality to search for Notes. Everything I added, I have also translated into German and English.

Closes #407

[codecov]

Codecov Report

Attention: Patch coverage is 4.21053% with 91 lines in your changes are missing coverage. Please review.

Project coverage is 37.01%. Comparing base (8b1088c) to head (50ab56c).

❗ Current head 50ab56c differs from pull request most recent head 84d3ad8. Consider uploading reports for the commit 84d3ad8 to get more accurate results

Files	Patch %	Lines
lib/pages/home/search.dart	1.09%	90 Missing ⚠️
lib/pages/home/home.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1137      +/-   ##
==========================================
- Coverage   37.16%   37.01%   -0.16%     
==========================================
  Files         108      109       +1     
  Lines        8500     8592      +92     
==========================================
+ Hits         3159     3180      +21     
- Misses       5341     5412      +71     

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