feat: make coercion of body values configurable

[friedow]

This will add a config flag to enable / disable coercion on request bodies. The default for body coercion is enabled for this not to become a breaking change.

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Closing issues

This fixes #1563 and it resolves #1444.

If this is a new feature submission:

• Has the issue had a maintainer respond to the issue and clarify that the feature is something that aligns with the goals and philosophy of the project? @WoH ;)

[WoH]

Can you rebase this?

[friedow]

I've rebased the branch. Any more comments @WoH or is this ready to be merged?

[WoH]

Since this is a larger one, I haven't had time to go though it in detail yet, but the structure LGTM.
If there are no obvious things missing, I will merge this for a new minor probably this week.
@jackey8616 you have any notes?

[jackey8616]

LGTM.

[friedow]

🥳