make the LogCollector fields public

[kevinheavey]

Problem

I need to use Refcell::replace on the collected logs instead of .take(), because I want to control the bytes_limit. This requires being able to construct a plain LogCollector instead of using new_ref_with_limit() which returns an Rc<RefCell<LogCollector>>.

I'd also like to be able to use a preallocated Vec for the messages field. At this point it seems simplest to just make all four fields public.

Summary of Changes

Makes the LogCollector fields pub

[buffalojoec]

wfm!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.1%. Comparing base (d9d52be) to head (2db28fb).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #1075     +/-   ##
=========================================
- Coverage    82.1%    82.1%   -0.1%     
=========================================
  Files         868      868             
  Lines      234074   234126     +52     
=========================================
+ Hits       192373   192408     +35     
- Misses      41701    41718     +17