Adds LazyRawTextReader support for comments

[zslayton]

Builds on #609 and #612. Adds support for reading

// rest-of-the-line

and

/* multi
    line  */

comments.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Patch coverage: 98.24% and project coverage change: +0.01% 🎉

Comparison is base (789f2fb) 81.64% compared to head (fba4677) 81.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #613      +/-   ##
==========================================
+ Coverage   81.64%   81.66%   +0.01%     
==========================================
  Files         118      118              
  Lines       21147    21202      +55     
  Branches    21147    21202      +55     
==========================================
+ Hits        17266    17315      +49     
- Misses       2225     2231       +6     
  Partials     1656     1656              

Files Changed	Coverage Δ
src/lazy/text/raw/reader.rs	72.35% <94.44%> (+4.13%)	⬆️
src/lazy/text/buffer.rs	85.21% <100.00%> (-0.04%)	⬇️

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[zslayton]

One of the unit tests in the windows GitHub action fails sporadically due to different float rounding behavior. I've captured that in #625 and will address it when the merge queue is empty.