RUMM-2563: Create storage and uploader outside of the feature

[0xnm]

What does this PR do?

Storage and DataUploader are pulled outside of the feature-specific classes, because core module will be responsible for those two.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #1070 (86e2a3f) into feature/sdkv2 (f5dd448) will increase coverage by 0.20%.
The diff coverage is 93.14%.

@@                Coverage Diff                @@
##           feature/sdkv2    #1070      +/-   ##
=================================================
+ Coverage          82.96%   83.16%   +0.20%     
=================================================
  Files                306      306              
  Lines              10158    10176      +18     
  Branches            1658     1649       -9     
=================================================
+ Hits                8427     8462      +35     
+ Misses              1219     1213       -6     
+ Partials             512      501      -11     

Impacted Files	Coverage Δ
.../kotlin/com/datadog/android/v2/core/DatadogCore.kt	80.65% <88.71%> (+9.22%)	⬆️
...in/com/datadog/android/core/internal/SdkFeature.kt	91.23% <100.00%> (-0.84%)	⬇️
...istence/file/batch/BatchFilePersistenceStrategy.kt	100.00% <100.00%> (ø)
...ror/internal/CrashReportFilePersistenceStrategy.kt	100.00% <100.00%> (ø)
...adog/android/error/internal/CrashReportsFeature.kt	96.77% <100.00%> (ø)
...in/com/datadog/android/log/internal/LogsFeature.kt	92.31% <100.00%> (ø)
.../log/internal/domain/LogFilePersistenceStrategy.kt	100.00% <100.00%> (ø)
...lin/com/datadog/android/rum/internal/RumFeature.kt	91.75% <100.00%> (ø)
.../rum/internal/domain/RumFilePersistenceStrategy.kt	100.00% <100.00%> (ø)
...datadog/android/tracing/internal/TracingFeature.kt	93.33% <100.00%> (ø)
... and 13 more