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Add signature help provider #117

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Builds on top of #116
Fixes #87

Adds a signature help provider, which can show the signature of the function being called while typing the function call.

Example in starlark_syntax/testcases/parse/aspect.star:
Screenshot 2024-03-15 at 14 37 49

Also includes the parameter and function documentation, if present:
Screenshot 2024-03-15 at 14 39 11

This allows requesting a list/tree of symbols in the current document.
The following items are currently exposed:

- `load` statements:
    - The module path
    - The loaded symbol names
- `def` statements:
    - The function node
    - Argument names
- Closures, when assigned to a named variable
- Structs (calls to `struct`), when assigned to a named variable
- Build system targets (function calls containing a `name` argument)
Allow passing in an `--eager` flag to the LSP to make it eagerly load
all relevant files in the workspace. When this flag is provided, files
are not removed from the `last_valid_parse` cache when they are closed.

In addition, this flag enables the LSP to provide workspace symbol
information.
…}` and `starlark_lsp::symbol::{Symbol, SymbolKind}`
@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Mar 15, 2024
@MaartenStaa MaartenStaa force-pushed the signature-help-provider branch from 3b644ce to 401e180 Compare March 15, 2024 14:05
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lsp doesn't support parameter hints
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