AbstractSyntaxNode generalization & convenience

[timholy]

These add a couple more convenience methods useful for TypedSyntax.

[codecov[bot]]

Codecov Report

Merging #208 (bc172a1) into main (20b3b3e) will increase coverage by 3.70%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #208      +/-   ##
==========================================
+ Coverage   91.23%   94.93%   +3.70%     
==========================================
  Files          15       15              
  Lines        3593     3793     +200     
==========================================
+ Hits         3278     3601     +323     
+ Misses        315      192     -123     

Impacted Files	Coverage Δ
src/syntax_tree.jl	96.27% <100.00%> (+0.20%)	:arrow_up:
src/tokenize_utils.jl	100.00% <0.00%> (ø)
src/tokenize.jl	98.35% <0.00%> (+0.06%)	:arrow_up:
src/parse_stream.jl	95.75% <0.00%> (+0.45%)	:arrow_up:
src/parser.jl	97.95% <0.00%> (+0.67%)	:arrow_up:
src/parser_api.jl	82.97% <0.00%> (+0.75%)	:arrow_up:
src/green_tree.jl	80.00% <0.00%> (+0.93%)	:arrow_up:
src/source_files.jl	85.71% <0.00%> (+1.09%)	:arrow_up:
src/literal_parsing.jl	97.87% <0.00%> (+1.89%)	:arrow_up:
... and 5 more

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[timholy]

I think these are the last obvious additions needed by TypedSyntax. What are your thoughts on a new release?

[c42f]

If you need it released, let's release 0.3.1 right away!

[c42f]

https://github.com/JuliaLang/JuliaSyntax.jl/pull/209