RUMM-2864 add support to AP1

[xgouchet]

What does this PR do?

Adds support to the AP1 (Japan) datacenter

Additional Notes

We also use subdomainless endpoints, which are not necessary since API v2 where the track is part of the path.

[0xnm]

lgtm! I like the change to switch to remove feature-specific intakes.

[codecov-commenter]

Codecov Report

Merging #1268 (db007d7) into develop (31b0121) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1268      +/-   ##
===========================================
- Coverage    82.01%   81.99%   -0.02%     
===========================================
  Files          361      361              
  Lines        12832    12820      -12     
  Branches      2149     2146       -3     
===========================================
- Hits         10524    10511      -13     
- Misses        1655     1656       +1     
  Partials       653      653              

Impacted Files	Coverage Δ
...main/kotlin/com/datadog/android/DatadogEndpoint.kt	0.00% <ø> (ø)
...src/main/kotlin/com/datadog/android/DatadogSite.kt	100.00% <100.00%> (ø)
...atadog/android/core/configuration/Configuration.kt	98.13% <100.00%> (ø)
.../datadog/android/sessionreplay/utils/ThemeUtils.kt	83.33% <0.00%> (-16.67%)	⬇️
...rsistence/file/batch/PlainBatchFileReaderWriter.kt	81.54% <0.00%> (-1.54%)	⬇️
...lin/com/datadog/android/rum/internal/RumFeature.kt	92.09% <0.00%> (-1.44%)	⬇️
...ain/java/com/datadog/opentracing/PendingTrace.java	59.48% <0.00%> (-0.86%)	⬇️
.../kotlin/com/datadog/android/v2/core/DatadogCore.kt	85.59% <0.00%> (-0.42%)	⬇️
.../android/rum/internal/domain/scope/RumViewScope.kt	95.45% <0.00%> (ø)
...in/com/datadog/android/log/internal/LogsFeature.kt	86.92% <0.00%> (+1.54%)	⬆️
... and 2 more