Implement dynamical decoupling.

[babacry]

Add dynamical decoupling operations to circuits for idle moments.

Two methods are provided to apply dynamical decoupling.

1. Schema "XX_PAIR" and "YY_PAIR" are provided.
2. Users can provide their own base dynamical decoupling sequence via base_dd_sequence.

We repeat given dd sequence in continuous idle moments until the remaining idle moments isn't long enough for another repetition.

[babacry]

Post the draft for general suggestions.

And see how the CI goes compared with local CI.

[codecov[bot]]

Codecov Report

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

Project coverage is 97.79%. Comparing base (bfba965) to head (b9c9557). Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6515      +/-   ##
==========================================
- Coverage   97.79%   97.79%   -0.01%     
==========================================
  Files        1124     1126       +2     
  Lines       95705    95784      +79     
==========================================
+ Hits        93595    93670      +75     
- Misses       2110     2114       +4     

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[babacry]

Thanks for the careful review, everyone!