Rename *Camera*Containers to *Telescope*Containers

[StFroese]

Yes, I'd go so far to rename most of the containers from camera to telescope. After all, we store them in .tel not .cam

Originally posted by @maxnoe in #2168 (comment)

[kosack]

Sounds good. The Camera name came from a time before there was a standard data model, so it's confusing. It will break some external code like LSTChain/NectarChain, but that is fine, just need to mark the PR as "breaking-change".

[maxnoe]

This is done as part of #2204