Store step name instead of position

[IlyaSemenov]

Currently, the stack frame stores the position of the step which called wait():

https://github.com/IlyaSemenov/grammy-scenes/blob/84a1082d43441a2cebdc8b85bfb09facc49e681e/src/types.ts#L12-L17

https://github.com/IlyaSemenov/grammy-scenes/blob/84a1082d43441a2cebdc8b85bfb09facc49e681e/src/scenes_manager.ts#L118-L121

As I elaborated in #1, this approach is easy to use for the developer but breaks UX for users that were in the middle of a scene when it gets slightly updated and the step positions shift. If we store step names instead of positions that will be much more reliable (and we could even allow developers to add optional fallback steps for legacy users).

• [x] every wait() call must accept label, such as wait("name")
• [x] call() must only allowed to be made ~from within a labelled step~ when the next step (a return point) is labeled
• [x] prevent adding two labels for a single step to prevent ambiguity when discovering current step name
• [x] recognize old session format for backwards compatibility

[github-actions[bot]]

:tada: This issue has been resolved in version 10.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: