Add regolith-filter tag to the repository

[Nusiq]

The filter resolver repository uses regolith-filter "topic" to detect repositories with regolith filters. This way the filter can be automatically added to the resolver allowing easier installation of the filter, with command:

regolith install nbt-to-mcstructure

The GitHub action that manages the resolver repository runs once per day.

[Nusiq]

Additionally you could add a special tag that regolith uses for versioning to tag the version of the filter. The tags use pattern - <filter-name>-<semver>. In case of this repository it should be: nbt-to-mcstructure-1.0.0 or some other version number if you prefer a different one.

[Nusiq]

Apparently the default resolver repository doesn't use the regolith-filter topic to find repositories anymore, since June 2023 when we accepted this PR - Bedrock-OSS/regolith-filter-resolver#10.

I guess I just forgot about it or didn't know about it (since I wasn't involved). You can make a PR to add your repository URL to this list: https://github.com/Bedrock-OSS/regolith-filter-resolver/blob/main/repos.json