zach a517cd23be feat: enable wasmtime caching (#605) ...

Alternate to: #596 without support for manually compiling/loading native
code

- Enables wasmtime caching: https://docs.wasmtime.dev/cli-cache.html
- Adds `EXTISM_CACHE_CONFIG` and `PluginBuilder::with_cache_config` to
determine where to load a custom cache configuration from
- Adds `PluginBuilder::with_cache_disabled` to disable the cache when
initializing a plugin
  - Setting `EXTISM_CACHE_CONFIG=""` will also disable caching 

## Performance

With caching:
```
create/create_plugin    time:   [2.9079 ms 2.9139 ms 2.9200 ms]                                  
                        change: [+3.2677% +3.6399% +3.9766%] (p = 0.00 < 0.20)
                        Change within noise threshold.
```

Compared to `main`:
```
create/create_plugin    time:   [26.089 ms 26.498 ms 26.923 ms]                                 
                        change: [+0.1729% +2.0868% +4.1337%] (p = 0.04 < 0.20)
                        Change within noise threshold.
```

2023-11-28 11:50:21 -08:00

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