Implement ordered list state for FnApi.

[shunping]

First attempt to implement ordered list state for FnApi. Notice that caching has not been implemented yet.

Reference: https://docs.google.com/document/d/1U77sAvE6Iy9XsVruRYHxPdFji7nqS6HPi1XU8fhyrxs/

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.13%. Comparing base (8a64641) to head (b481880). Report is 1 commits behind head on master.

:exclamation: Current head b481880 differs from pull request most recent head f4c3440

Please upload reports for the commit f4c3440 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #30317      +/-   ##
============================================
- Coverage     71.18%   71.13%   -0.06%     
  Complexity     3014     3014              
============================================
  Files          1058     1055       -3     
  Lines        134076   133466     -610     
  Branches       3254     3254              
============================================
- Hits          95437    94935     -502     
+ Misses        35498    35400      -98     
+ Partials       3141     3131      -10     

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