chore(weave): soft deletion for objects server

[gtarpenning]

Description

WB-20784

Server side objects deletion. This pr introduces two main features:

• the object query now filters out deleted objects
• add an obj_delete endpoint to delete object versions (and the whole object)

Usage:

api = weave.init("griffin_wb/test-delete")

v0 = weave.publish({"i": 1}, name="obj_1")
v1 = weave.publish({"i": 2}, name="obj_1")
v2 = weave.publish({"i": 3}, name="obj_1")

# delete the object version v1
client.server.obj_delete(tsi.ObjDeleteReq(
     project_id="griffin_wb/test-delete",
     object_id="obj_1",
     digests=[v1.digest],
))
# now we should have only v0 and v2...

# delete v2 with the "latest" alias
client.server.obj_delete(tsi.ObjDeleteReq(
     project_id="griffin_wb/test-delete",
     object_id="obj_1",
     digests=["latest"],
))

# now delete all versions
client.server.obj_delete(tsi.ObjDeleteReq(
     project_id="griffin_wb/test-delete",
     object_id="obj_1",
))

Testing

• adds tests
• decent coverage on existing tests

Using the clickhouse console in production, with the new objects query, I identified no discernible performance impact. We only add an extra count, which appears to add little to no overhead.

Prod:

Branch: