Support for additional collection endpoints

[tjoubert]

GET/_api/collection/{collection-name}/checksum Return checksum for the collection
PUT/_api/collection/{collection-name}/loadIndexesIntoMemory Load Indexes into Memory
PUT/_api/collection/{collection-name}/recalculateCount Recalculate count of a collection
PUT​/_api​/collection​/{collection-name}​/responsibleShard Return responsible shard for a document
GET/_api/collection/{collection-name}/shards Return the shard ids of a collection
PUT/_api/collection/{collection-name}/compact Compact a collection

[DiscoPYF]

Thank you @tjoubert , looks good. I left a few comment regarding aligning some method names with others by adding the HTTP method suffix, for concistency, and various other minor items.

Happy to merge once discussed/done.

[tjoubert]

@DiscoPYF , thanks for your review. I've made all the relevant changes :-)

[DiscoPYF]

Looks great, thank you! I'm happy to merge pending passing CI checks.

We need to set them up again now that the repo is in a different org. I have emailed @rossmills99 and @Zyqsempai