Feat/email load globalTemplateVars async

[mschipperheyn]

Description

This PR adds an async function call as an alternative to the static globalTemplateVars in the Email-Plugin. The function receives the RequestContext and the Injector. It has the objective to allow you to load theme variables that may be specific to e.g. a channel. Such as a footer text or color schemes, etc

I did get a whole bunch of eslint related warnings when I committed this and had to use --no-verify. But they didn't apply to my code.

I'm assuming documentation is extracted from the inline docs I added. Not sure how that works.

Breaking changes

Screenshots

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Checklist

📌 Always:

• [x ] I have set a clear title
• [ x] My PR is small and contains a single feature
• [x ] I have checked my own PR

👍 Most of the time:

• [ x] I have added or updated test cases
• [ x] I have updated the README if needed

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Jul 16, 2024 4:57pm

[michaelbromley]

Excellent work: clean code, good test case, excellent docs 👍

One small change needed on a doc block, and also please target the minor branch rather than master.

[michaelbromley]

Setting docsWeight 0 will force this type to the top of the EmailPluginOptions docs page, which is not what we want. Better to have the main EmailPluginOptions interface at the top. So remove this to be safe add it to the EmailPluginOptions doc block to ensure it always stays at the top.

[michaelbromley]

Since the master will be merged into minor today anyway with the upcoming release, I decided to merge anyway, since the time-zone difference would delay things.

Thanks for the contribution!