chore (npm): add ignore list

[erisu]

Motivation, Context & Description

• Add .npmignore file
• Remove files that are not needed to be packaged with the release build.
• Decrease package size

Before Ignore

=== Tarball Details ===
package size:  1.9 MB
unpacked size: 3.5 MB
total files:   390

After Ignore

=== Tarball Details ===
package size:  420.0 kB
unpacked size: 1.2 MB
total files:   185

Testing

• cordova platform add
• cordova build
• cordova run

Checklist

• I've run the tests to see all new and existing tests pass

[codecov-commenter]

Codecov Report

Merging #863 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #863   +/-   ##
=======================================
  Coverage   74.85%   74.85%           
=======================================
  Files          13       13           
  Lines        1742     1742           
=======================================
  Hits         1304     1304           
  Misses        438      438           

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