No unknown operations diagnostic

[NathanSnail]

Adds diagnostic to prevent operations which result in an unknown value. Differences with no-unknown diagnostic is that no-unknown is when the type of a binding cannot be inferred whereas this is for the types of expressions who's values are inferred resulting in a value who's type can't be inferred (including values which are never used in a binding). Catches common typo mistakes like

---@param name string
---@return string
local function greet(name)
    return "Hello " .. name "!" -- <-- Note the missing ..
end

Needs ./tools/build-doc.lua and ./tools/locale.lua run.

I'm not sure if this diagnostic should be enabled by default, it's kind of similar to need-check-nil and if it does trigger it's almost certainly a bug which is unlike the other disabled by default diagnostics which are more code quality focused.

[gemini-code-assist[bot]]

Summary of Changes

Hello @NathanSnail, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new diagnostic, no-unknown-operations, designed to identify and flag expressions where the outcome of an operation, such as a function call or a binary operation, results in an unknown type. This diagnostic is crucial for catching subtle programming errors and typos that might otherwise lead to unexpected type inference issues, thereby improving code reliability and type safety. It complements existing diagnostics by focusing specifically on the inferability of operation results.

Highlights

• New Diagnostic no-unknown-operations: Introduces a new diagnostic to detect operations (calls, binary operations) that result in an unknown type, even when input types are known.
• Distinction from no-unknown: Clarifies that this diagnostic targets unknown expression results rather than unknown binding types, helping to catch common typos like missing concatenation operators.
• Enhanced Operator Handling: Refactors script/vm/operator.lua by introducing vm.getOperators to improve how operators are retrieved and processed, and adds an isCallable method to vm.Infer in script/vm/infer.lua.
• Localization and Configuration: Adds new diagnostic messages in locale/en-us/script.lua and registers the diagnostic in locale/en-us/setting.lua and script/proto/diagnostic.lua as a 'strong' warning.
• Comprehensive Test Cases: Includes a new test file test/diagnostics/no-unknown-operations.lua with various scenarios to validate the diagnostic's effectiveness.

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