Add Docs: Ethereum Provider section in typescript.md

[KipCrossing]

In this PR:

• docs for "viem/window" and EIP1193Provider

It would be good to let the user know about typing support for window.ethereum; Especially considering this project adopts ddd.

This section was added to typescript.md as per this discussion: #977

Happy to update or move, let me know.

---

PR-Codex overview

This PR adds a window polyfill for viem that allows window.ethereum to be typed as an EIP1193Provider with a fully-typed request function and typed events.

Detailed summary

• Adds a window polyfill for viem
• window.ethereum is typed as an EIP1193Provider
• Includes a fully-typed request function and typed events
• window.ethereum may be undefined in certain cases

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Latest commit: cf5e8ab

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Name	Status	Preview	Updated (UTC)
viem	✅ Ready (Inspect)	Visit Preview	Aug 7, 2023 3:16pm

[codecov]

Codecov Report

Merging #993 (3cc78d2) into main (e4a870e) will decrease coverage by 4.74%.
Report is 2 commits behind head on main.
The diff coverage is n/a.

❗ Current head 3cc78d2 differs from pull request most recent head f685bfa. Consider uploading reports for the commit f685bfa to get more accurate results

@@            Coverage Diff             @@
##             main     #993      +/-   ##
==========================================
- Coverage   99.79%   95.05%   -4.74%     
==========================================
  Files         262      259       -3     
  Lines       25745    25574     -171     
  Branches     2071     1829     -242     
==========================================
- Hits        25691    24310    -1381     
- Misses         51     1254    +1203     
- Partials        3       10       +7     

see 49 files with indirect coverage changes

[jxom]

Thanks!