feat(cli)!: configurable backoff

[Natoandro]

• Make the backoff configurable through the --retry and --retry-interval-ms options.
• The default max retry count is changed to 0 on the default mode, and remains 3 on the watch mode.
• The --max-parallel-loads option has been renamed to --threads.

Migration notes

The --max-parallel-loads option has been renamed to --threads.

• The change comes with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.91%. Comparing base (a2a97ed) to head (981778e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #789   +/-   ##
=======================================
  Coverage   69.91%   69.91%           
=======================================
  Files         139      139           
  Lines       16181    16181           
  Branches     1475     1475           
=======================================
  Hits        11313    11313           
  Misses       4843     4843           
  Partials       25       25           

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