Profile and improve performance

[BPerlakiH]

Related to #1167

Things I have found on macOS and iPhone.

Both the date formatter and the web-view configuration object is slow to create and we only really need one of each.

The date formatter is mainly used in defaultResponseHeaders (video local streaming).

BEFORE:

AFTER:

---

And opening a new browser tab is also improved.
(The first time measured will be longer in both cases, as the configuration and the first browser setup will take more time).

BEFORE

TIMER:: BrowserViewModel.init() took: 0.2607688333373517
TIMER:: BrowserViewModel.init() took: 0.011252750060521066
TIMER:: BrowserViewModel.init() took: 0.011210291646420956
TIMER:: BrowserViewModel.init() took: 0.011013375013135374

AFTER

TIMER:: BrowserViewModel.init() took: 0.1968754583504051
TIMER:: BrowserViewModel.init() took: 0.012397083337418735
TIMER:: BrowserViewModel.init() took: 0.005758291692472994
TIMER:: BrowserViewModel.init() took: 0.003947708290070295
TIMER:: BrowserViewModel.init() took: 0.004706125007942319

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 23.90%. Comparing base (c8aa5f5) to head (8d56783).

Files with missing lines	Patch %	Lines
Model/Utilities/Date+Extension.swift	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1168      +/-   ##
==========================================
+ Coverage   23.43%   23.90%   +0.47%     
==========================================
  Files         137      137              
  Lines        7263     7266       +3     
==========================================
+ Hits         1702     1737      +35     
+ Misses       5561     5529      -32     

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