Support scim json format

[caryyu]

As I'm recently starting to integrate the Okta SCIM into our system, I've discovered this lib doesn't provide a flexible way to extend the content-type for SCIM-JSON that the protocol asks for, here comes the proposal/workaround.

BTW: Maybe another better way is to expose the extension of jsonTypes outside the code :)

Here's the protocol detail: https://www.rfc-editor.org/rfc/rfc7644#section-3.12

Checklist

• [x] I have ensured my pull request is not behind the main or master branch of the original repository.
• [x] I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• [x] I have written a commit message that passes commitlint linting.
• [x] I have ensured that my code changes pass linting tests.
• [x] I have ensured that my code changes pass unit tests.
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[fengmk2]

4.4.0