Reflactor: new json array support and add json tree of abacus-output

[grysgreat]

Linked Issue

Fix #3686
Fix #3705

What's changed?

• Add new json array support.
• Change old add_json function: support array index in number instead of string.
• Add json part of abacus - output.
• Adjust old add_json function into new add_Json

[grysgreat]

Now we can add json array in this way:

    Json::AbacusJson::add_json({"array","1","new_add_notLast"}, "correct1",false);
    Json::AbacusJson::add_json({"array","0","new_add_Last"}, "correct2",false);

where "0" means add in the last position. Other is the array index(start by 1).

[pxlxingliang]

Please add some comments to explain how to use the add_json function.

[grysgreat]

Please add some comments to explain how to use the add_json function.

Comments in the code are added in [abacusjson.h] now .

[grysgreat]

New json file is as follow.

Run calculate case of examples/relax/pw_al.

abacus.json

[grysgreat]

Now add new implementation of add_json function by custom heterogeneous containers.

eg.

Json::AbacusJson::add_json({"key",0}, 4,true);

[WHUweiqingzhou]

LGTM.