Describe all callable arguments with types for Promise and Deferred

[clue]

This changeset describes all callable arguments with types for Promise and Deferred. In particular, this makes it easier to detect incorrect usage using static analysis, such as when omitting required arguments as discussed in #213 and #138.

Builds on top of #247, #246 and others
Closes#252

[stof]

I suggest adding checkMissingCallableSignature: true in the phpstan config, so that it reports missing callable signatures.

[clue]

I suggest adding checkMissingCallableSignature: true in the phpstan config, so that it reports missing callable signatures.

Go ahead, PRs welcome 👍 Tested this out locally and appears to report a number of low-priority types for internal functions and tests only, but happy to consider this if the changeset is reasonable 👍

[stof]

I'll let you merge this PR first then, so that those types are already defined.

[SimonFrings]

👍

[WyriHaximus]

👍