[golang/go] x/tools/gopls: hover: more informative description of embedded methods

### ROOT CAUSE The issue arises because the current hover functionality in gopls does not sufficiently highlight that a method belongs to an embedded type. This lack of context makes it ambiguous whether the method is part of an embedded type or a standalone method, reducing the tool's utility for developers who rely on accurate hover information for embedded methods. ### CODE FIX To address this, modify the hover generation logic in gopls to explicitly indicate when a method is embedded. Here's the technical solution: 1. **Update the `hover` function** in `gopls/internal/lsp/protocol/hover.go` to include embedded type information. Specifically, when generating hover content for a method, check if the receiver type is embedded in any struct or interface. 2. **Add logic to detect embedded types** by querying the Go AST for struct literals or interface types that embed the receiver type. This can be done using the `golang.org/x/tools/go/ast` and `golang.org/x/tools/go/types` packages. 3. **Format the hover output** to include the embedded context. For example: ``` # Method func (receiverType) methodName() [description] ## Type receiverType ## Embedding receiverType is embedded in struct/interfaceName. ``` This change ensures developers can quickly identify embedded methods and their embedding contexts, improving the overall developer experience.