pdk-proxy-wasm-stub 1.6.0

Due to a linker error in Windows (https://github.com/rust-lang/rust/issues/86125) that fails when importing a crate that has external symbols, even when they are not being used, we need a proxy-wasm-stub for non wasm32 targets that does not define any extern functions in order to be able to run cargo test (which does not and can not use wasm32 as compilation target)
Documentation
Builds

pdk-proxy-wasm-stub's sandbox limits

All the builds on docs.rs are executed inside a sandbox with limited resources. The limits for this crate are the following:

Available RAM 6.44 GB
Maximum rustdoc execution time 15 minutes
Maximum size of a build log 102.4 kB
Network access blocked
Maximum number of build targets 10

If a build fails because it hit one of those limits please open an issue to get them increased.