Support primitive static final fields as constant args in access paths

[msridhar]

Noticed a case like this in Uber code.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.10%. Comparing base (b7dad0c) to head (329f01c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...in/java/com/uber/nullaway/dataflow/AccessPath.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1105      +/-   ##
============================================
- Coverage     88.11%   88.10%   -0.02%     
  Complexity     2208     2208              
============================================
  Files            84       84              
  Lines          7177     7177              
  Branches       1424     1425       +1     
============================================
- Hits           6324     6323       -1     
  Misses          430      430              
- Partials        423      424       +1     

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