Release share v0.51.0 (2023-12-06)

=== New features

* lib/http: implement Server-Sent Events (SSE)
* lib/net: add method Read
* lib/crypto: add support for reading passphrase using SSH_ASKPASS
* lib/memfs: add method JSON to Node

=== Enhancements

* lib/ini: create the file if its not exist on Open
* lib/net: use [time.Ticker] to loop in WaitAlive
* lib/memfs: add sub file system
* lib/memfs: improve the refresh method
* lib/ini: append variable into section before any empty lines
* lib/memfs: stop all Watcher spawn by DirWatcher
* lib/memfs: remove embedding os.FileInfo and http.File
* lib/memfs: refactoring, simplify DirWatcher logic
* email/dkim: set ExpiredAt to MaxInt64 if value is greater than 12 digits
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