fix: Allow synchronous handlers

[seb-cr]

The current type of LambdaWrapper#wrap requires handlers to return a Promise. We should support synchronous handlers too.

No implementation change is required – they're already supported, just disallowed by the type system.

Jira: ENG-2732

[corinja]

Sorry about this but can I ask a stupid question, as I don't feel that comfortable with Typescript generics. The intention here is to allow the function to return a Type or a Promise that returns a Type. Why isn't T enclosed in <> tags? Just a link to relevant reading will do as an answer!!

[seb-cr]

Sorry about this but can I ask a stupid question, as I don't feel that comfortable with Typescript generics. The intention here is to allow the function to return a Type or a Promise that returns a Type. Why isn't T enclosed in <> tags? Just a link to relevant reading will do as an answer!!

<> is used when declaring or passing type parameters. T is a type parameter, but once defined can be used like any other type.

It's akin to "normal" function parameters: you declare your function foo(bar) { /* do something */ }, and within foo you can use the name bar just like that.

TS docs: https://www.typescriptlang.org/docs/handbook/2/generics.html

[github-actions]

🎉 This PR is included in version 2.0.0-beta.7 🎉

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