feat: provide the zellij version to plugins

[jaeheonji]

resolves #888

[jaeheonji]

I did some research on this feature.
The initial (my stupid) idea was to provide the zellij version when wasmer invokes the plugin's load function.

For some reason I changed the implementation direction.

1. The data type that can be provided as a plugin through wasmer's call is only integer. Of course other types are possible with "slightly" complicated methods.
2. Already in the wasm_vm.rs there is a nice way called plugin API !!

So I made a pluginAPI that simply outputs the zellij version. The plugin only needs to call the get_zellij_version function.

[a-kenji]

LGTM, but would like to have a 2nd pair of eyes here.

[TheLostLambda]

I think we could improve the code here a little, let me experiment for a moment!

[TheLostLambda]

Sorry for the delay in getting back to you!

I think we can reuse the object_from_stdin() function we already have, since String is deserializable!

Here is the diff that worked for me!

[TheLostLambda]

Otherwise things look stellar! Thanks for doing this @jaeheonji !

[jaeheonji]

@TheLostLambda Thanks for reviewing! I applied the part you suggested :)

[a-kenji]

Awesome, thank you!