feat: allow getSessionKey to use extended ctx type

[KnightNiwrem]

As of now, we are unable to use narrowed Context type for getSessionKey because the parameter type of ctx is fixed to Context - TS Playground

This change attempts to provide getSessionKey's ctx parameter with the narrowed Context type so that the following can be accomplished.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6b67444) 34.95% compared to head (1f92a6e) 34.95%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #390   +/-   ##
=======================================
  Coverage   34.95%   34.95%           
=======================================
  Files          16       16           
  Lines        4806     4806           
  Branches      168      168           
=======================================
  Hits         1680     1680           
  Misses       3124     3124           
  Partials        2        2           

Impacted Files	Coverage Δ
src/convenience/session.ts	96.88% <100.00%> (ø)

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[KnorpelSenf]

I remember trying this but due to some covariance/contravariance problems these changes would break a lot of bots. It is a conscious decision not to have it parameterised.

Perhaps I was wrong, so we could well spend some time on testing this once more. I'm just very careful here.

[KnorpelSenf]

I no longer know what the issue was. Let's ship this and see if this breaks anything. There is a chance that I am confusing this with initial, which could take a context object but does not.

@EdJoPaTo it would be helpful to have you test these changes on a few bots of yours.

One thing we certainly have to change is the availability of ctx.session inside getSessionKey:

[KnorpelSenf]

Also, please fixup CI.

[KnorpelSenf]

Also, please fixup CI.

nvm, I did this now

[KnorpelSenf]

LGTM, thanks! 🎉