Support for extra Futures classes

[msridhar]

This allows for a list of classes to be passed in via a command-line argument -XepOpt:NullAway:ExtraFuturesClasses. Such classes will be treated equivalently to built-in Guava Futures classes via the FluentFutureHandler. This is a follow-up to #771.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (3fc9b8a) 86.98% compared to head (e8127e5) 87.07%.
Report is 4 commits behind head on master.

Files	Patch %	Lines
...c/main/java/com/uber/nullaway/NullabilityUtil.java	66.66%	1 Missing and 2 partials ⚠️
...away/src/main/java/com/uber/nullaway/NullAway.java	93.75%	0 Missing and 2 partials ⚠️
...ava/com/uber/nullaway/generics/GenericsChecks.java	88.88%	0 Missing and 2 partials ⚠️
...src/main/java/com/uber/nullaway/LibraryModels.java	66.66%	1 Missing ⚠️
...llaway/dataflow/AccessPathNullnessPropagation.java	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #909      +/-   ##
============================================
+ Coverage     86.98%   87.07%   +0.09%     
- Complexity     1959     1989      +30     
============================================
  Files            77       77              
  Lines          6330     6423      +93     
  Branches       1223     1244      +21     
============================================
+ Hits           5506     5593      +87     
- Misses          420      422       +2     
- Partials        404      408       +4     

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[yuxincs]

LGTM for allowing more customizations of handling Future classes.

[tbroyer]

Could https://github.com/uber/NullAway/wiki/Configuration be updated? as 0.10.23 was released with this change
(I generally copy the description to my Gradle plugin, to make sure I don't describe things wrong)
TIA

[msridhar]

Thanks for the reminder! I've added docs here:

https://github.com/uber/NullAway/wiki/Configuration#extra-futures-classes

[tbroyer]

Thanks, just published version 2.0.0 of the plugin that adds support for this in the DSL (major version bump due to removing support for Gradle 5.2 → 6.7)