Adds HtmlStripProcessor and UriPartsProcessor

[flobernd]

Adds HtmlStripProcessor and UriPartsProcessor.

Related to #2231
Related to elastic/elasticsearch-net#7881

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
ingest.delete_geoip_database	🟢	1/1	1/1
ingest.delete_pipeline	🟢	15/15	15/15
ingest.geo_ip_stats	🟢	1/1	1/1
ingest.get_geoip_database	🟢	4/4	4/4
ingest.get_pipeline	🔴	22/22	21/22
ingest.processor_grok	🟢	1/1	1/1
ingest.put_geoip_database	🟢	3/3	3/3
ingest.put_pipeline	🔴	50/59	59/59
ingest.simulate	🔴	6/9	9/9

You can validate these APIs yourself by using the make validate target.

[pquentin]

Thanks! Processors are our biggest gap currently. I checked that those additions match with the Elasticsearch documentation.

Unfortunately, we don't have specific YAML tests for those processors, so we can't validate those changes more.