Add external licenses to jar

[spacey-sooty]

Description

This adds external licenses (fetched from an ExternalLicenses folder) into our jar and headers zip. This is required to follow the license of some of our dependencies.

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why, including events that led to this PR
• If this PR changes behavior or adds a feature, user documentation is updated
• If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• If this PR touches configuration, this is backwards compatible with all settings going back to the previous seasons's last release (seasons end after champs ends)
• If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• If this PR addresses a bug, a regression test for it is added

[spacey-sooty]

Depends on PhotonVision/rubik_jni#27

[samfreund]

Depends on PhotonVision/rubik_jni#27

Not anymore :ha: