check for androidx availability on runtime

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

check for androidx availability on runtime

💡 Motivation and Context

if you don't want to use the release health feature, you actually can exclude it.
just to avoid an error if you have enabled it and can't use androidx, we check on runtime via reflection.

💚 How did you test it?

running it/build.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

[codecov-io]

Codecov Report

Merging #356 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #356      +/-   ##
============================================
- Coverage     58.97%   58.95%   -0.02%     
- Complexity      758      759       +1     
============================================
  Files            87       87              
  Lines          3534     3538       +4     
  Branches        338      340       +2     
============================================
+ Hits           2084     2086       +2     
- Misses         1300     1301       +1     
- Partials        150      151       +1     

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/io/sentry/core/cache/SessionCache.java	55.73% <0.00%> (-0.69%)	23.00% <0.00%> (ø%)
...c/main/java/io/sentry/core/DirectoryProcessor.java	69.38% <0.00%> (+2.04%)	8.00% <0.00%> (+1.00%)

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