(3/4) RUM-2129 Implement AbstractStorage

[xgouchet]

This PR has been created automatically by splitting a large branch

Pull request 3 out of 4

The overall goal is to create a feature allowing customers to store unsent data any way they want (instead of using the official disk batch files)

This PR implements our Internal Storage interface based on a PersistenceStrategy, in a Consent Aware manner. This means that the tracking of consent is handled internally, and our customers don't need to worry about that part.

[codecov-commenter]

Codecov Report

Merging #1747 (729ec6a) into xgouchet/RUM-2129/2_custom_persistence_mgt (c2a203b) will increase coverage by 0.06%.
The diff coverage is 100.00%.

Additional details and impacted files

@@                              Coverage Diff                               @@
##           xgouchet/RUM-2129/2_custom_persistence_mgt    #1747      +/-   ##
==============================================================================
+ Coverage                                       83.29%   83.35%   +0.06%     
==============================================================================
  Files                                             466      467       +1     
  Lines                                           16189    16239      +50     
  Branches                                         2412     2417       +5     
==============================================================================
+ Hits                                            13484    13536      +52     
- Misses                                           2043     2044       +1     
+ Partials                                          662      659       -3     

Files	Coverage Δ
...droid/core/internal/persistence/AbstractStorage.kt	100.00% <100.00%> (ø)
...d/core/internal/persistence/ConsentAwareStorage.kt	98.78% <100.00%> (ø)
...tadog/android/core/internal/persistence/Storage.kt	100.00% <ø> (ø)

... and 29 files with indirect coverage changes