[FR]: example of a plugin compiled from Rust

[alexeagle]

What is the current behavior?

Followup to #149 which introduces plugin support but only documents how to use them for pre-built plugins distributed as wasm files.

Describe the feature

https://github.com/aspect-build/rules_swc/pull/149#issuecomment-1422987161 suggests that users ought to be able to use rules_rust to have their plugin code live in the monorepo alongside the swc_plugin rule.

/cc @realtimetodie @titanous

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