No completion for enum methods or associated values

[PgBiel]

Describe the bug
Autocomplete doesn't work for enum instances' methods or associated values.

I suspect this is due to the lack of special handling similar to that of structs in the enum branch of isCompletingAChain, below.

c3-lsp/server/internal/lsp/search/search_completion_list.go

Lines 277 to 289 in 904e095

	case *symbols.Enum:
	enum := prevIndexable.(*symbols.Enum)
	for _, enumerator := range enum.GetEnumerators() {
	if !filterMembers || strings.HasPrefix(enumerator.GetName(), symbolInPosition.Text()) {
	items = append(items, protocol.CompletionItem{
	Label: enumerator.GetName(),
	Kind: &enumerator.Kind,
	// No documentation for enumerators at this time
	Documentation: nil,
	})
	}
	}

To Reproduce
Steps to reproduce the behavior:

1. Open a project with an enum, say CoolEnum with a constant ENUM_A, and a method, say fn int CoolEnum.give(self)
2. Type CoolEnum.ENUM_A.g somewhere
3. No completion appears
4. Try the same by adding an associated value, e.g. enum CoolEnum : (int name) and then ENUM_A = 5
5. Type CoolEnum.ENUM_A.nam
6. No completion appears

Expected behavior
Should have suggested the give method and the name fields respectively

Screenshots

Desktop (please complete the following information):

• OS: Linux
• Editor: VSCode, Zed
• Version: 0.3.3+

[pherrymason]

This will also be more easy to fix/implement in the next version ;)