feat(md,wit): format WIT and nested code inside markdown files

[mkatychev]

!!WIP!!

WIT formatting:
topiary fmt ./**/*.wit

markdown formatting (only formats WIT, toml codeblocks):
topiary fmt ./**/*.md --skip-stage host --skip-language rust

[mkatychev]

up to us what indentation we prefer, this can be set in .topiary/languages.ncl similar to the indent key here:
https://github.com/topiary/topiary/blob/c72efbfd164f98e5d2fab70a7c984280e0a90378/topiary-config/languages.ncl#L284-L294

[mkatychev]

used to skip mdbook directives

[mkatychev]

nofmt is picked up by this query to skip WIT fragments:

component-docs/.topiary/queries/injections.scm

Line 6 in 969ae33

(#not-match? @info ".*(nofmt|rust).*")

[mkatychev]

up to us if we want to preserve double newlines between certain items

[vados-cosmonic]

Yeah let's have newlines between this, but only for worlds? I like the idea of separating the imports, includes and exports in a world declaration

[mkatychev]

Neat thing about diff grammar is that technically so adding a language hint can actually allow one to format it if the code fence start was changed to something like this by formatting new and old state separately:

```diff wit
world app { 
    import calculate; 
+   export wasi:cli/run@0.2.7; 
} 
```

component-docs/component-model/src/tutorial.md

Lines 128 to 133 in 969ae33

	```diff
	world app {
	import calculate;
	+ export wasi:cli/run@0.2.7;
	}
	```

[mkatychev]

The repo has a mix of 2 and 4 space indentation for WIT and this helps align it.

[mkatychev]

rustfmt canll be used for the rust formatting backend once topiary/bud#8 is implemented (as well as gofmt for go codeblocks and whatever else):

component-docs/component-model/src/language-support/using-wit-resources/rust.md

Lines 243 to 245 in 39e62fc

	```rust
	impl docs::rpn::types::HostEngine for MyHost {
	fn new(

[mkatychev]

nofmt will eventually be removed once hideline fragments are properly handled in topiary:

Suggested change

	```wit nofmt
	```wit,hidelines=!!!
	!!! interface foo {

[vados-cosmonic]

It would be nice if we defaulted to a space between items inside an interface.

[mkatychev]

Should this apply to worlds as well? We can do only a subset of each as well:
https://github.com/bytecodealliance/tree-sitter-wit/blob/f777cdbe11281ccc68ffa30bd7ea34cdf4ddbec6/grammar.js#L139-L146

    world_definition: ($) =>
      choice(
        $.export_item,
        $.import_item,
        $.use_item,
        $.typedef_item,
        $.include_item,
      ),
    // ...
    _interface_definition: ($) =>
      choice(
        $.use_item,
        seq(optional($.external_id), choice($.typedef_item, $.func_item)),
      ),