v2.2.0-alpha.3

[prescottprue]

Description

• fix(storage): prevent undefined (within metadata) from being written to database which causes an error for RTDB
• fix(storage): return metadata push key from upload promise - uploadFiles - metadata key just returning dbPath #547

Check List

If not relevant to pull request, check off as complete

• All tests passing
• Docs updated with any changes or examples if applicable
• Added tests to ensure new feature(s) work properly

Relevant Issues

• uploadFiles - metadata key just returning dbPath #547

[codecov]

Codecov Report

Merging #550 into next will increase coverage by 0.02%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             next     #550      +/-   ##
==========================================
+ Coverage   92.38%   92.41%   +0.02%     
==========================================
  Files          23       23              
  Lines        2547     2556       +9     
  Branches      405      404       -1     
==========================================
+ Hits         2353     2362       +9     
  Misses        194      194