The code for file creation and error handling in desc_source.go has been refactored. Previously, the file closure operation was executed irrespective of whether the file was created successfully or not. Now, the file will only be closed if it was successfully created, improving error handling.
Added a new function, `WriteProtoFiles` in `desc_source.go` which is used to generate .proto files. The process involves resolving symbols from the descriptor source and writing their definitions to a designated output directory. The corresponding flag `--proto-out` has been included in `grpcurl.go` to allow users to specify the directory path.
* update to latest jhump/protoreflect
* be lenient when possible if server cannot furnish all dependencies
* move linting back to go 1.21 instead of latest go 1.22
* make staticcheck happy
* organize into multiple files
* make listing methods show fully-qualified names
* address small feedback from recent change (trim then check if empty)
Eitol