Remove usage of url node module

[cmdcolin]

the end result being that less polyfills are needed. the behavior of 'dynamically switching to use localfile' is something that can instead be solved by user code if they need it

[cmdcolin]

xref GMOD/jbrowse-components#4296

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 90.26%. Comparing base (9021a23) to head (c7dae63).

❗ Current head c7dae63 differs from pull request most recent head 814e925. Consider uploading reports for the commit 814e925 to get more accurate results

Files	Patch %	Lines
src/io/index.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
+ Coverage   90.21%   90.26%   +0.05%     
==========================================
  Files          39       38       -1     
  Lines        1962     1952      -10     
  Branches      395      400       +5     
==========================================
- Hits         1770     1762       -8     
+ Misses        191      176      -15     
- Partials        1       14      +13     

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