TS type defs

[tisd]

Added ts type declaration file, also added the corresponding "types" entry in package.json

[codecov]

Codecov Report

Merging #67 into execution will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           execution      #67   +/-   ##
==========================================
  Coverage      75.63%   75.63%           
==========================================
  Files             16       16           
  Lines            472      472           
  Branches          54       54           
==========================================
  Hits             357      357           
  Misses            88       88           
  Partials          27       27

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