1538: Introduce environment variable to control dovecot full-text-search r=mergify[bot] a=tremlin
## What type of PR?
Enhancement
## What does this PR do?
In #1320 a full-text-search feature was enabled in Dovecot by default. Since this can have a big impact on performance, I think it's preferable to offer an option to disable the feature if it is not needed. This PR doesn't change the default behavior (FTS on).
### Related issue(s)
- #1320
## Prerequistes
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.
- [ ] In case of feature or enhancement: documentation updated accordinagly
- [ ] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.
Co-authored-by: Thomas Rehn <thomas.rehn@initos.com>
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