Release v0.10.0-dev.7

Note: This release has breaking changes.

• REFACTOR: let the blossom repository authorise on refusal.
• REFACTOR: surface the http status code on every request failure.
• FIX: stay anonymous with each blossom server until it refuses.
• FIX: use hex secret in nostrconnect URI.
• FIX: keep an anonymous blossom report anonymous.
• FIX: carry the blossom authorization through every request it makes.
• FEAT: pass an auth policy through the files facade.
• FEAT: let a blossom operation say which identity it may reveal.
• FEAT: add the blossom authorization, the repository half of a policy.
• BREAKING FEAT: drop blossom useAuth and customSigner in favour of auth.