[Repo Assist] perf/refactor: unify canBind* helpers; skip Array.filter on bindAll path

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Summary

Two closely-related improvements to ProvidedTypes.fs (Tasks 8 & 5):

Task 5 — Coding improvement: unify canBind* helpers

The five visibility-filter helpers (canBindConstructor, canBindMethod, canBindProperty, canBindField, canBindEvent) had identical bodies:

hasFlag bindingFlags BindingFlags.Public && c.IsPublic
|| hasFlag bindingFlags BindingFlags.NonPublic && not c.IsPublic

These are now expressed via a shared canBindByVisibility inline helper, reducing duplication and making the pattern more explicit.

Task 8 — Performance improvement: skip Array.filter on the bindAll path

In TargetTypeDefinition.GetMethods(bindingFlags) (and GetConstructors, GetFields, GetEvents, GetProperties, GetNestedTypes), every call previously did:

methDefs.Force() |> Array.filter (canBindMethod bindingFlags)

methDefs.Force() is cached (Lazy), but Array.filter allocates a new array on every call. When both Public and NonPublic are in bindingFlags every member passes the filter — the allocation is wasted.

The new isVisibilityBindAll helper detects this case and returns the cached array directly:

let arr = methDefs.Force()
if isVisibilityBindAll bindingFlags then arr else arr |> Array.filter (canBindMethod bindingFlags)
```

The F# compiler uses `bindAll = DeclaredOnly ||| Public ||| NonPublic ||| Static ||| Instance` for all member-enumeration calls, so this eliminates a redundant O(n) allocation on every `Get*` call against every `TargetTypeDefinition` (the target-assembly-backed type representation used by all generative type providers).

The same optimisation is applied to `TypeSymbol.Get*` for `TargetGeneric` instantiations.

## Test Status

```
Passed! - Failed: 0, Passed: 157, Skipped: 0, Total: 157

All 157 tests pass with no changes to test code.

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