feat: Support relays and naddrs sets

This commit introduces support for 'sets', a feature that simplifies
referencing multiple relays or naddrs with a single word.

Sets are stored in the config directory under `n34` as `config.toml` in
`TOML` format. The config path follows the `$XDG_CONFIG_HOME` standard,
defaulting to `$HOME/.config` if unset.

The `n34 sets` command allows managing sets, adding, removing, updating,
or displaying them. When using the main `--relays` flag, a set name can
be provided to automatically expand its relays (an error occurs if the
set contains no relays). Similarly, any command accepting naddrs can
reference a set to extract its naddrs.

Sets can also be merged by updating a set while specifying another
set in `--repo` merges their naddrs, while `--set-relays` merges their
relays. Removal follows the same pattern.

Signed-off-by: Awiteb <a@4rs.nl>

CHANGELOG.md

@@ -15,10 +15,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Read the `nostr-address` file in `issue new` command - by Awiteb
 - Read the `nostr-address` file in `reply` command - by Awiteb
 - A `--quote-to` flag to quote the replied to content in the editor - by Awiteb
+- Enter repository as nip5 - by Awiteb
+- Make the relays list optional - by Awiteb
+- Events and naddrs can starts with `nostr:` - by Awiteb
+- Support relays and naddrs sets - by Awiteb
 
 ### Dependencies
 
 - Add `chrono@0.4.41` to the dependencies - by Awiteb
+- Enable `nip05` feature of `nostr` crate - by Awiteb
+- Add `serde@1.0.219`, `dirs@6.0.0` and `toml@0.8.22` - by Awiteb
+
+### Fixed
+
+- Create a valid naddr string - by Awiteb
+
+### Refactor
+
+- Support more than one naddr instead of one - by Awiteb
 
 ## [0.1.0] - 2025-05-21