Add wasm ctor and dtor calls to non-main exports in core

[jeffcharles]

Description of the change

Adds calls to __wasm_call_ctors and __wasm_call_dtors in Wizer init function and javy.invoke function in javy_core.wasm.

Why am I making this change?

These functions need to be called in non-main functions that are exported from Rust crates that are compiled to a Wasm bin for parts of the WASI context to be initialized properly. This isn't currently causing a problem but would block code that tries to read environment variables or use directory preopens from working properly.

Checklist

• I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-core do not require updating CHANGELOG files.
• I've updated the relevant crate versions if necessary. Versioning policy for library crates
• I've updated documentation including crate documentation if necessary.