Provide navigation for nested symbols (blocks/attributes)

[radeksimko]

Current Version

0.9.0

Use-cases

Navigation could be easier through more complex and nested configs if the user could also see and navigate through all the nested structures - blocks and attributes.

Proposal

Leverage NestedSymbols() of the existing struct as implemented in hcl-lang:
https://pkg.go.dev/github.com/hashicorp/hcl-lang@v0.0.0-20201110071249-4e412924f52b/decoder#Symbol

Related LSP methods

https://microsoft.github.io/language-server-protocol/specifications/specification-current/#textDocument_documentSymbol

[ghost]

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