解决了性能问题

官方优化了内部的contrcts实现代码结构，但是性能降低了5倍

第一个版本，功能足够，性能稳定

Add from/to_tag_and_arg (tweag#1939)

* Add from/to_tag_and_arg

This commit adds two functions to convert enums to and back from
records, as a tag and an optional argument. Such functions are useful to
handle enums in a general, dynamic way, while pattern matching requires
to know in advance the possible tags.

Additionally, we also implement a `map` function, which can be derived
from the conversions above.

* Update core/stdlib/std.ncl

Co-authored-by: jneem <joeneeman@gmail.com>

* Update core/stdlib/std.ncl

Co-authored-by: jneem <joeneeman@gmail.com>

* Update core/stdlib/std.ncl

Co-authored-by: jneem <joeneeman@gmail.com>

---------

Co-authored-by: jneem <joeneeman@gmail.com>

[release.sh] update to 1.6.0

Add 1.5 release notes

[release.sh] update to 1.4.1

[release.sh] update to 1.4.0

Update Cargo.lock

Update Cargo.lock