bump version to v1.7.0

[joein]

# Changelog

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## Features

* Add Discovery API (discovery and context search) - https://github.com/qdrant/qdrant-client/pull/319 by @coszio
  - **Discovery search**: Uses a target and context pairs to limit the search space during the search
  - **Context search**: Using only the context pairs, get the points that live in the best zone
* Add Sparse vectors support - https://github.com/qdrant/qdrant-client/pull/378 by @agourlay
  - Combine the dense and sparse vectors to build hybrid search
* Add Manhattan distance support - https://github.com/qdrant/qdrant-client/pull/391 by @generall
* Add custom shard key API - https://github.com/qdrant/qdrant-client/pull/391 by @generall
  - Configure how to distribute points among shards

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## Fixes

* https://github.com/qdrant/qdrant-client/pull/337 - Add `wait` parameter to snapshots API by @joein

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[timvisee]

✔️ , given that all CI will be 🟢 as well.