Added support for Vec<UUID> // Array(UUID)

[JaminMartin]

Summary

Added serde::uuid_vec for serializing/deserializing Vec<uuid::Uuid> to/from Array(UUID), including an option submodule for Option<Vec> <--> Nullable(Array(UUID)). I have also updated the README with a usage example in the UUID section.

Reason

I found the need to have an array of UUID's in my data structure and clickhouse-rs does not currently support it. I tested my table against the python-sdk and it worked fine, so I thought I would implement it for clickhouse-rs as it is my primary clickhouse sdk.

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided so that we can include it in CHANGELOG later
• For significant changes, documentation in README and https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

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