I rewrote the `connect-flash` package

Noticing the lack of activity on this repo and wanting to add extended typescript flavor to the flashing utility, I made an attempt to write a flash library using TypeScript.
It will provide for express folks:

- Ability to strictly type the flash keys and their value types
- Ability to override the save and get methods to provide custom data handling
- More importantly, no more `deprecationWarning`

[saifsweelam/typed-flash](https://github.com/saifsweelam/typed-flash)

This is the first release, I hope you try it and give me your thoughts. If you face any problems please report through issues.

The issue points to the external saifsweelam/typed-flash repository rather than naming a change in connect-flash. Start by reviewing that package and the stated goals for typed flash keys, custom save/get methods, and deprecation-warning removal; the issue does not define a repository-local completion criterion.

Written by the indexing model from the issue text.