Planned v1.0.0 release

[chill117]

Create backwards-compatible v0.22 release; deprecate the following:

• mysql and sqlite3 data stores
• built-in signed URL support

Create v1.0.0 release with the following breaking changes:

• Remove support for mysql and sqlite3 data stores
• Remove built-in signed URL support - this can be done via hooks plus methods provided by lnurl-offline-node