Migrate to `yaml` npm package

[cowboyd]

In order to support documentation quick-views inside the language server, and for improved stack traces, we should use the modern, more actively maintained YAML parser. https://eemeli.org/yaml/#comments-and-blank-lines

I tried using this package before and it may require some fixes to make it work with Deno.

[cowboyd]

This is currently also blocking compiling the pls executable because the compiled version blows up with this:

$ ./pls ./artist-lookup-catalog-info.ps.yaml
error: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'length')
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    at e.qn [as resolve] (https://esm.sh/v96/yaml-ast-parser@0.0.43/deno/yaml-ast-parser.js:6:3198)
    at K (https://esm.sh/v96/yaml-ast-parser@0.0.43/deno/yaml-ast-parser.js:17:5378)
    at uo (https://esm.sh/v96/yaml-ast-parser@0.0.43/deno/yaml-ast-parser.js:17:1303)
    at K (https://esm.sh/v96/yaml-ast-parser@0.0.43/deno/yaml-ast-parser.js:17:4752)
    at po (https://esm.sh/v96/yaml-ast-parser@0.0.43/deno/yaml-ast-parser.js:17:7001)
    at Hi (https://esm.sh/v96/yaml-ast-parser@0.0.43/deno/yaml-ast-parser.js:18:197)
    at ke (https://esm.sh/v96/yaml-ast-parser@0.0.43/deno/yaml-ast-parser.js:19:347)
    at parse (file:///Users/cowboyd/Code/@frontside/yamlscript/evaluate.ts:173:16)
    at load (file:///Users/cowboyd/Code/@frontside/yamlscript/load.ts:8:16)
    at load.next (<anonymous>)