Libcouchbase3 for merge

[lemenkov]

Summary
Make module cachedb_couchbase compatible with @couchbase's libcouchbase ver. 3.

Details
libcouchbase ver. 3 broke API and already 5 years old. Let's make this module compatible with this library. See also PR #2913 and #2389.

Compatibility
Module will require libcouchbase >= 3.0.0.

Closing issues
N/a.

[github-actions]

Any updates here? No progress has been made in the last 30 days, marking as stale.

[bogdan-iancu]

@lemenkov , thank you for this great work. As I do not have much experience with CouchDB, I have to 100% rely on your testing and consistency on this work.
BTW, I assume the new version is no longer compatible with pre ver. 3 CouchDB API, right? If so, is this something to worry?

[lemenkov]

@lemenkov , thank you for this great work. As I do not have much experience with CouchDB, I have to 100% rely on your testing and consistency on this work. BTW, I assume the new version is no longer compatible with pre ver. 3 CouchDB API, right? If so, is this something to worry?

Yes, unfortunately. It's not compatible anymore with pre-3.xy versions. I've tried to keep it compatible but the amount of work was too much at that time.

[bogdan-iancu]

I see... any idea of how widely the pre-2.xy versions are still used by distros? as if not, we should consider acceptable the lost of compatibility with the old versions.