[INSD-8271] Fix Network Requests Logging on iOS

[DavidMina96]

Description of the change

Problem

The below error message is logged, and network requests aren't captured on iOS:
“[Instabug] - IBGCore: Error requestHeaders values should be of type string not __NSArrayM”.

This is due to some checks recently added in the native iOS SDK, expecting the request and response headers to be a dictionary of String key-value pairs while we allow dynamic values.

Solution

Stringify the values in requestHeaders and responseHeaders maps before passing the network data params to the native SDK.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Issue links go here

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests

Code review

• This pull request has a descriptive title and information useful to a reviewer
• Issue from task tracker has a link to this pull request

[codecov]

Codecov Report

Merging #280 (1aa6818) into master (925b493) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
+ Coverage   81.74%   81.84%   +0.09%     
==========================================
  Files          17       17              
  Lines         367      369       +2     
==========================================
+ Hits          300      302       +2     
  Misses         67       67              

Impacted Files	Coverage Δ
lib/src/models/network_data.dart	100.00% <100.00%> (ø)

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