chore: refactor paginator

[chejimmy]

What this PR does / why we need it:

• simplify the SiteWise Queries pagination logic:
  • currently, the pagination logic under src/requestLooper.ts has a confusing call logic where it keeps creating new Observable to subscribe to in order to paginate exhaustively
  • scattered logic - src/requestLooper.ts attempted to generalize the logic by accepting 4 callbacks; it creates a fragmented logic between caller and requestLooper, hence, making the logic flow harder to follow
• this PR attempts to simplify the logic by:
  1. method paginateQuery paginate in a more tradition do...while... loop to handle asynchronous iteration; this is achievable after turning the super.query(...) into Promise; it is ok to do so since the SiteWise Query is not streaming and not necessary to apply the Observable pattern;
  2. streamlining the pagination logic under src/SiteWiseQueryPaginator.ts (see method paginateQuery); append frame data and getting next queries in the same method
• added unit testings for pagination - after the simplification, it allows the unit tests to be added easily

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

• src/getNextQueries.ts is copied from src/DataSource.ts

[chejimmy]

LGTM.

Just need to fix the yarn spellcheck by fixing the typo Pagainating in src/SiteWiseQueryPaginator.test.ts. Also ddced in the nextToken is being picked up as an unknown word by the spellcheck. You can replace that substring in the token with some random characters to make it pass the spellcheck.

🙏 TY for the review; updated for spellcheck 👍