[enrich/demographics] Fix fetching authors with min and max dates

[zhquan]

This code fixes fetching all authors with min and max dates. Currently, ElasticSearch and OpenSearch use composite aggregation to paginate all buckets.

The old query only returns 10000 items and also returns the following warning message:

Deprecation: This aggregation creates too many buckets (10001) and
will throw an error in future versions. You should update the
[search.max_buckets] cluster setting or use the [composite]
aggregation to paginate all buckets in multiple requests.

Tests added acconrdingly.

Signed-off-by: Quan Zhou quan@bitergia.com

[coveralls]

Pull Request Test Coverage Report for Build 2434201959

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 46 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 82.387%

---

Files with Coverage Reduction	New Missed Lines	%
/home/runner/work/grimoirelab-elk/grimoirelab-elk/grimoire_elk/enriched/enrich.py	46	73.16%
<!--	Total:	46		-->

Totals
Change from base Build 2434131458:	0.04%
Covered Lines:	8841
Relevant Lines:	10731

---

💛 - Coveralls

[jjmerchante]

LGTM