provide index in package types & parser + export more interface in the root index

[Nexucis]

That should ease the import when someone want to use this lib.

[codecov-io]

Codecov Report

Merging #132 (31d0a11) into master (88d36a2) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   71.97%   72.11%   +0.14%     
==========================================
  Files          11       13       +2     
  Lines         578      581       +3     
  Branches      131      131              
==========================================
+ Hits          416      419       +3     
  Misses        103      103              
  Partials       59       59              

Impacted Files	Coverage Δ
src/lang-promql/complete/hybrid.ts	63.51% <100.00%> (-0.16%)	⬇️
src/lang-promql/parser/index.ts	100.00% <100.00%> (ø)
src/lang-promql/parser/matcher.ts	89.36% <100.00%> (ø)
src/lang-promql/parser/parser.ts	64.18% <100.00%> (-0.48%)	⬇️
src/lang-promql/parser/type.ts	68.96% <100.00%> (ø)
src/lang-promql/parser/vector.ts	89.28% <100.00%> (ø)
src/lang-promql/types/index.ts	100.00% <100.00%> (ø)

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[juliusv]

👍