Refactor how guest exported tasks work #2955

Job	Run time
Rustfmt	11s
Build wit-bindgen (x86_64-linux, ubuntu-latest)	2m 23s
Check	2m 22s
Build wit-bindgen (x86_64-macos, macos-latest, x86_64-apple-darwin)	1m 57s
Test (ubuntu-latest, c)	6m 1s
Crate Unit Tests	1m 35s
Test (ubuntu-latest, rust)	7m 11s
verify-publish	2m 51s
Build wit-bindgen (aarch64-macos, macos-latest, aarch64-apple-darwin)	2m 0s
Test (ubuntu-latest, csharp)	16m 47s
Build wit-bindgen (x86_64-windows, windows-latest)	5m 51s
Test (macos-latest, c)	6m 11s
Build wit-bindgen (aarch64-linux, ubuntu-latest, aarch64-unknown-linux-gnu)	2m 54s
Test (macos-latest, rust)	5m 56s
Test (windows-latest, c)	13m 15s
Test (windows-latest, rust)	15m 34s
Test (windows-latest, csharp)	23m 31s
Record the result of testing and building steps	1s
	1h 56m 31s

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