feat: add `iterateTokens` method

[fisker]

PR Checklist

• [x] Addresses an existing open issue: #755
• [ ] That issue was marked as status: accepting prs
• [x] Steps in CONTRIBUTING.md were taken

Overview

Part of #755, this one is unlike forEachComments, we only need yield tokens. We can decide what to do with the comments in a follow-up pr.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 61.00%. Comparing base (491c037) to head (a208135).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #756   +/-   ##
=======================================
  Coverage   61.00%   61.00%           
=======================================
  Files          35       35           
  Lines        2921     2921           
  Branches      463      464    +1     
=======================================
  Hits         1782     1782           
  Misses       1139     1139           

Flag	Coverage Δ
4.8.4	58.61% <100.00%> (ø)
latest	60.32% <100.00%> (ø)

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