0.7.0: SSL / TLS support, PHP 8.1 fixes

• Fixed PHP 8.1 compatibility for IteratorAggregate / ArrayAccess return
  type declarations
  (@thekid)
• Fixed issue #4: Cannot handle binary subtype 3 - @thekid
• Enable SSL/TLS if ssl=true or tls=true is passed in the connection
  string parameters; implements feature request #2
  (@thekid)
• Made params for Collection::command() optional - @thekid