Add plan executors for KQIR via iterator model

[PragmaTwice]

In this PR we add plan executors and its context according to the iterator model.

TODO list:

• [x] Limit
• [x] Noop
• [x] Sort
• [x] Merge
• [x] Projection
• [x] Filter
• [x] TopN Sort
• [x] Mock (for test purpose)
• [ ] FullIndexScan
• [ ] NumericFieldScan
• [ ] TagFieldScan

[PragmaTwice]

Seems there are too many files changed. Let's start the review, and the rest two executor will be implemented in the next PR.

cc @git-hulk @mapleFU

[sonarcloud[bot]]

Quality Gate passed

Issues
38 New issues
0 Accepted issues

Measures
0 Security Hotspots
61.8% Coverage on New Code
1.9% Duplication on New Code

See analysis details on SonarCloud