Feature request: main implementation, randomization, middy middleware, correlation ID's, optional: object merging about aws-lambda-powertools-typescript HOT 7 CLOSED

Writing down my understanding from our discussion yesterday:

1. We have tests where Math.random yields a spread (or entropy) that's too large (i.e. 50 to 150). We should find some random that reduces the entropy, preferably to something like 90 to 110. This should not increase the bundle size significantly.
2. Decorators only work for classes, but many people use functional programming with TypeScript, and as far as I understand we can't decorate functions (which are not part of classes). Therefore we want to investigate if we can add logging/tracing/metrics via middy middleware. Example pseudo code below:

app
    .use(cors())
    .use(tracing()
    .use(metrics({coldStarts: true})

3. No further details, as there's a full issue: #129
4. Lodash was used because it was easy to get started. It's a big library though, so we'd like to replace it with something simpler and smaller.

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Regarding number 4, a quick win until we have our own implementation could be to switch to lodash.merge and lodash.clonedeep instead of importing the full package.

Just for context, these two are the functions that I saw are used in the Logger and that are exported as separate packages.

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@bahrmichael your understanding is 100% correct.

@dreamorosi well spotted! I wasn't aware that separated packages formats exist.

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Middy middleware implemented in #313

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2, 4 have been addressed.

1 won't be part of the GA milestone and 3 has its own issue.

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