lsp: handle textDocument/documentSymbol
#668
Merged
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More weekend fun! This provides a basic implementation of
textDocument/documentSymbol
. I say basic because we currently scan for nested symbols, but only package, rules and functions, with some nice touches like providing details on what kind of rule it is, and the type it returns, and so on. I think this covers what most actually need, but we can certainly refine this later and add things like variables inside of rule bodies, and so on.