Add additional clickhouse database datetime functions

[AndrewSpeed]

What changed?

Adds several of the clickhouse datetime functions, specifically:

• toStartOfMinute
• toStartOfFiveMinutes
• toStartOfTenminutes
• toStartOfFifteenMinutes
• toStartOfHour

resolves #124

[AndrewSpeed]

@jayvynl I'm unable to reproduce these CI failures locally, I've tried several of the python and django versions and haven't encountered the same errors, even with CLICKHOUSE_VERSION=latest like is being used for the CI runs

[jayvynl]

@jayvynl I'm unable to reproduce these CI failures locally, I've tried several of the python and django versions and haven't encountered the same errors, even with CLICKHOUSE_VERSION=latest like is being used for the CI runs

3969971854e9 Pull complete ，check if clickhouse docker image digest matches, there must be a change about the default user in recent clickhouse release , the ci failure is about clickhouse authentication.

[AndrewSpeed]

I've added an explicit CLICKHOUSE_PASSWORD as suggested in this stackoverflow answer that it may resolve authentication failures between cluster nodes

[AndrewSpeed]

@jayvynl it looks like the last CI failure is a known issue with docker, a re-run may cause the test to pass

[jayvynl]

@jayvynl it looks like the last CI failure is a known issue with docker, a re-run may cause the test to pass

No need, I will just merge. Thank you very much.