Orb packing should allow nested directories

[Xavientois]

Meta:

CircleCI CLI Version:
0.1.19878+e4216bd (homebrew)

Operating System:

MacOS Monterey

CircleCI CLI Diagnostic:

---
CircleCI CLI Diagnostics
---
Debugger mode: false
Config found: /Users/********/.circleci/cli.yml
API host: https://circleci.com
API endpoint: graphql-unstable
Error: please set a token with 'circleci setup'
You can create a new personal API token here:
https://circleci.com/account/api

---

Current behavior:

Any sub-directories within the commands, jobs, and executors directories are ignored when I run circleci orb pack src/ from the root of my orb repo.

Expected behavior:

When I am separating my orb's commands, executors, etc into files, I want to be able to organize them into sub-directories rather than just having all of the files directly in the commands or jobs directories.

When did this begin / Was this previously working?:

Always been the case, I believe.

Additional Information:

Currently, the Golang yaml marshalling is used, leading to the current behaviour:

circleci-cli/cmd/orb.go

Line 991 in e4216bd

y, err := yaml.Marshal(&tree)