Update RPC source adapter (#26)

* Update RPC source adapter

* PR fixes

* add comment

Author: tmosleyIII

.gitignore

@@ -65,3 +65,7 @@ docs/cdp-vs-benthos-comparison.md
 docs/future-inspired-enhancements.md
 docs/future-best-practices-for-cdp.md
 docs/SETUP_GITHUB_PAGES.md
+docs/rpc-adapter-streaming-checkpointing.md
+PR_REVIEW_FIXES.md
+PR_REVIEW_RESPONSE.md
+PR_REVIEW_SUMMARY.md