refactor!: make use of NIPs easier

[hasundue]

• refactor: move std/streams.ts to lib/
• build: create lib and std modules

[codecov]

Codecov Report

Attention: Patch coverage is 77.14286% with 40 lines in your changes are missing coverage. Please review.

Project coverage is 83.35%. Comparing base (b887f8e) to head (70d907e).

❗ Current head 70d907e differs from pull request most recent head 9839388. Consider uploading reports for the commit 9839388 to get more accurate results

Files	Patch %	Lines
std/signs.ts	48.78%	21 Missing ⚠️
nips/nodes.ts	67.56%	12 Missing ⚠️
core/relays.ts	91.66%	3 Missing ⚠️
nips/01/relays.ts	57.14%	3 Missing ⚠️
lib/streams.ts	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
- Coverage   86.73%   83.35%   -3.38%     
==========================================
  Files          17       20       +3     
  Lines         618      679      +61     
  Branches       43       41       -2     
==========================================
+ Hits          536      566      +30     
- Misses         80      111      +31     
  Partials        2        2              

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