Use Activator.CreateInstance in CosmosGrainStorage when record does n… #3088

Job	Run time
Azure Cosmos DB provider tests	0s
Azure Storage provider tests	0s
Build (ubuntu-latest)	2m 14s
Cassandra provider tests (Cassandra, 3.11)	3m 55s
Build (windows-latest)	4m 54s
Consul provider tests (Consul)	5m 26s
Cassandra provider tests (Cassandra, 4.0)	4m 23s
AWS DynamoDB provider tests (DynamoDB)	5m 41s
Cassandra provider tests (Cassandra, 4.1)	4m 23s
MariaDB/MySQL provider tests (MySql)	2m 36s
PostgreSQL provider tests (PostgreSql)	3m 1s
Redis provider tests (Redis)	4m 23s
Cassandra provider tests (Cassandra, 5.0)	4m 36s
Microsoft SQL Server provider tests (SqlServer)	3m 9s
ZooKeeper provider tests (ZooKeeper)	2m 35s
	51m 16s

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