Rename ev battery master

[lindnemi]

The old name is confusing. Only caveat: With this PR the Store has the exact same name as the bus. I don't think that's a problem but maybe there is a convention not to do that?

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to envs/environment.yaml.
• Changes in configuration options are added in all of config.default.yaml.
• Changes in configuration options are also documented in doc/configtables/*.csv.
• A release note doc/release_notes.rst is added.

[lindnemi]

Related PyPSA/pypsa-ariadne#127

[fneum]

Breaking change.

I think there are several instances where store has same carrier as bus.

[lindnemi]

I think there are several instances where store has same carrier as bus.

yes, i saw that, but i was not worried about the carriers but the names (since i changed the suffixes to be the same)