Add a node variant

[Luni-4]

This variant hides the crate used to handle nodes in the code.

Thanks in advance for your review! :)

[codecov-commenter]

Codecov Report

Merging #191 into master will increase coverage by 0.33%.
The diff coverage is 48.82%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   16.82%   17.16%   +0.33%     
==========================================
  Files          46       46              
  Lines        5879     5903      +24     
  Branches      698      698              
==========================================
+ Hits          989     1013      +24     
+ Misses       4490     4488       -2     
- Partials      400      402       +2     

Impacted Files	Coverage Δ
src/asttools.rs	0.00% <0.00%> (ø)
src/count.rs	0.00% <0.00%> (ø)
src/find.rs	0.00% <0.00%> (ø)
src/macros.rs	51.35% <ø> (ø)
src/metrics/halstead.rs	31.50% <ø> (+2.73%)	⬆️
src/metrics/mi.rs	64.70% <ø> (ø)
src/parser.rs	17.07% <0.00%> (-0.88%)	⬇️
src/preproc.rs	0.00% <0.00%> (ø)
src/metrics/exit.rs	44.68% <25.00%> (ø)
src/checker.rs	36.36% <28.57%> (-1.74%)	⬇️
... and 16 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 95b6e53...c9b76d9. Read the comment docs.

[calixteman]

Is this patch just aim to hide the use tree_sitter::Node; ?
Could you explain the exact rational ?

[Luni-4]

Is this patch just aim to hide the use tree_sitter::Node; ?
Could you explain the exact rational ?

Yep, the main goal consists of hiding tree_sitter::Node to users such that the Node struct can be exported in the documentation. I can't avoid showing it because that would mean a lack of documentation.

That's why I wanted to hide the library that handles nodes, and at the same time, the entire tree_sitter library would be completely handled internally by rust-code-analysis

[Luni-4]

This one seems a bit complicated instead, I couldn't think an alternative solution

[calixteman]

Please rebase.

[Luni-4]

Done.