feat: JSON tree typedefs & interface implementation with deepcopy

[bisakhmondal]

• Define JSON Node Interface
• Three different entity that implements the Node interface a. MapNode b. ListNode c. RegisterNode
• Instead of shallow copy a separate deep copy utility to aid cloning of JSON tree.

TODO:

• Implement Serialize and Deserialize methods of three different types. (suggestions: create a separate serializer interface and use that here to support different types of serialization on demand) (will be handled on a separate PR)
• Implement the ListNode InsertAtHead and InsertAfter method. (Will be handled by #9 )

Related Issue: #10

[codecov-commenter]

Codecov Report

Merging #11 (de342d1) into main (c9aecb3) will decrease coverage by 61.98%. The diff coverage is 31.81%.

@@             Coverage Diff              @@
##              main      #11       +/-   ##
============================================
- Coverage   100.00%   38.01%   -61.99%     
============================================
  Files            1        6        +5     
  Lines           11      121      +110     
============================================
+ Hits            11       46       +35     
- Misses           0       74       +74     
- Partials         0        1        +1     

Impacted Files	Coverage Δ
operations/defs/list_node.go	0.00% <0.00%> (ø)
operations/defs/json_node.go	20.93% <20.93%> (ø)
operations/defs/map_node.go	25.00% <25.00%> (ø)
operations/defs/register_node.go	54.54% <54.54%> (ø)
operations/defs/deepcopy_util.go	60.00% <60.00%> (ø)

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