Named params, stmt without cursor and many fixes

What's Changed

• Named columns refactor by @jairinhohw in #73
• Simple fix for the named parameters by @jairinhohw in #79
• Refactored rsfbclient-rust code to avoid panics by @jairinhohw in #80
• doc and identifier modifications by @dancingbug in #81
• Named params support started by @fernandobatels in #67
• Support for stmt execution without cursor by @fernandobatels in #77
• add opt-out and opt-in options to ci using labels by @dancingbug in #82

Full Changelog: v0.11.0...v0.12.0