feat(client): use FormData from node-fetch in node client

[jordanshatford]

see comment: #29 (comment)

NOTE: this will fix the issue for the node client, axios will still have bug when appending blob

The node-fetch library provides FormData directly, and it is much more in line with the built in FormData (stabilizing in node 21)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.87%. Comparing base (8994781) to head (2f8e730).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #173   +/-   ##
=======================================
  Coverage   91.87%   91.87%           
=======================================
  Files          66       66           
  Lines        3951     3951           
  Branches      476      476           
=======================================
  Hits         3630     3630           
  Misses        320      320           
  Partials        1        1           

Flag	Coverage Δ
unittests	91.87% <ø> (ø)

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