v4.4.3

This is Release 4.4.3

It includes the following features and fixes to 4.4.2:

- Features
  - Updates to the Darshan Store fields
  - Updates to the heartbeat sampler
  - Updates to the store_avro_kafka store
  - Updates to the rdc_sampler
  - Updates to the slingshot sampler

- Fixes
  - Decomposition fixes
  - Always generate and push store_avro_kafka schema to registry
  - Fix error path memory leaks in store_avro_kafka
  - Clarify dependencies in README.md
  - Fix crash in linux_proc_sampler