Updates wasm basic middleware and simplifies some code inside of it,
notably by using [waPC](https://github.com/wapc/wapc-go).
This changes the entrypoint function to be named "rewrite" and
uses a pool because known memory allocators are not goroutine
safe.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
Signed-off-by: Adrian Cole <adrian@tetrate.io>
Co-authored-by: Dapr Bot <56698301+dapr-bot@users.noreply.github.com>
Co-authored-by: Artur Souza <artursouza.ms@outlook.com>
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