Make extra parameters optional for JS/TS backends

[rogebrd]

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Merging #230 (4777f09) into main (0167584) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   51.72%   51.72%           
=======================================
  Files          37       37           
  Lines        8370     8370           
  Branches     1786     1786           
=======================================
  Hits         4329     4329           
  Misses       3727     3727           
  Partials      314      314           

Flag	Coverage Δ
unit	51.72% <0.00%> (ø)

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Impacted Files	Coverage Δ
stone/backends/js_types.py	0.00% <ø> (ø)
stone/backends/tsd_types.py	38.42% <0.00%> (ø)

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[eugeneyche]

lgtm; thanks!