Add version into deno bids-validator.js + create shim to run it

[yarikoptic]

This way anyone interested to use it could just

git clone --depth 1 -b deno-build http://github.com/bids-standard/bids-validator
export PATH="$PWD/bids-validator:$PATH"

and start using it and know which version it is:

❯ bids-validator -V
v1.14.6-dev.0-9-gdc61d0f3.deno

An alternative for shim would be just to create it in that branch and then remove in CI only the .js files. I would be happy to redo if feels more sensible.

[effigies]

This is fine with me. In general, it would be good to get the version into the builds. Running from deno.land also shows "alpha".

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.58%. Comparing base (bc15afc) to head (c01bc77).
Report is 25 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1942      +/-   ##
==========================================
+ Coverage   85.58%   86.58%   +0.99%     
==========================================
  Files          91      130      +39     
  Lines        3768     5964    +2196     
  Branches     1207     1481     +274     
==========================================
+ Hits         3225     5164    +1939     
- Misses        457      709     +252     
- Partials       86       91       +5     

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[yarikoptic]

yes - this is a poor man solution. Should remain working even when alpha would be replaced with a correct one! note that I added .deno at the end to tell them apart.