Send small variables to storage without blob storage

[khoaguin]

Issue: https://github.com/OpenMined/Heartbeat/issues/1274

• [x] Only save ActionObject to blob storage if it is bigger than a min_size variable (e.g. 16 MB)
• [x] The min size can be set with an environment variable (e.g. MIN_SIZE_BLOB_STORAGE_MB) so it can be configured when we change database implementations
• [x] Add tests for 2 cases: ActionObject bigger than MIN_SIZE_BLOB_STORAGE_MB and smaller than MIN_SIZE_BLOB_STORAGE_MB

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.52%. Comparing base (f115f2c) to head (113ffed).

Additional details and impacted files

Flag	Coverage Δ
activemq	?
azure_iot_edge	82.08% <ø> (ø)
cassandra	?
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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