Upgraded EventStoreDB client to 3.0.0

[oskardudycz]

Upgraded:

• EventStoreDB client to 3.0.0
• EventStoreDB Docker image to 21.10.5
• other dependencies

Besides that moved tests project into a dedicated stream metadata sample.

See more in:

• Upgraded EventStoreDB client to 3.0.0 #15
• Moved tests project into a dedicated stream-metadata sample #16

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This discussion was created from the release Upgraded EventStoreDB client to 3.0.0.