Feature Request: Setting message expiration

[pushrbx]

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Recently I've made a mistake with a sieve filter and I've accidentally set the expiration time on all the 70k+ message I have in my proton mail account. So I was looking for a way to revert it. I've found this repo, so I thought I'm going to make a modded proton bridge app which would just fix my silly mistake. However there wasn't any function available for interacting with the /mail/v4/messages/expire endpoint, so here it is.

This PR adds functions to interact with the /mail/v4/messages/expire API endpoint to set or remove expiration time on messages.

[jameshoulahan]

Thanks for that! Hope you managed to sort out your messages.

I'm keen to merge this; will run it past the rest of the team :)

[mbainter]

Any chance of getting this merged? I have recently been bitten in a similar fashion and realized with some surprise that there is no way provided to remove expiration from messages in bulk. It's an incredible feature to have, but it's powerful and easy to make mistakes with -- there needs to be some avenue for correcting it when it happens.