filelog: add file_name_resolved and file_path_resolved attributes

[sumo-drosiek]

Add file_name_resolved and file_path_resolved attributes. They are going to keep information about absolute path and file name after symlinks resolution

fixes #181

[codecov]

Codecov Report

Merging #184 (e2fcca1) into main (cc61797) will increase coverage by 0.0%.
The diff coverage is 86.2%.

@@          Coverage Diff          @@
##            main    #184   +/-   ##
=====================================
  Coverage   75.5%   75.6%           
=====================================
  Files         95      95           
  Lines       4360    4386   +26     
=====================================
+ Hits        3296    3319   +23     
- Misses       740     741    +1     
- Partials     324     326    +2     

Impacted Files	Coverage Δ
operator/builtin/input/file/reader.go	64.7% <69.2%> (-0.5%)	⬇️
operator/builtin/input/file/config.go	77.0% <100.0%> (+3.5%)	⬆️
operator/builtin/input/file/file.go	71.4% <100.0%> (ø)
pipeline/config.go	87.0% <0.0%> (-0.8%)	⬇️
agent/builder.go	91.6% <0.0%> (+0.4%)	⬆️
operator/builtin/input/tcp/tcp.go	74.5% <0.0%> (+1.6%)	⬆️
testutil/mocks.go	74.1% <0.0%> (+3.2%)	⬆️

[djaglowski]

Do you expect a performance hit here?

This could be computed once per Reader, but that would mean it does not detect changes in symlinks. So perhaps the next best thing would be to check if it is needed at all. Since the default configuration does not need it, this would potentially avoid a performance hit for many users.

[sumo-drosiek]

Closing in favor of #189