Added block interface and memory block implementations.

[vadlakondaswetha]

Description

Added block interface and memory block implementation

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - N/A since this is standlone class for now
2. Unit tests - Added
3. Integration tests - N/A

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.06%. Comparing base (6d24bbd) to head (8468693).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/block/block.go	87.50%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2600      +/-   ##
==========================================
- Coverage   78.13%   78.06%   -0.07%     
==========================================
  Files         107      108       +1     
  Lines       11844    11860      +16     
==========================================
+ Hits         9254     9259       +5     
- Misses       2083     2091       +8     
- Partials      507      510       +3     

Flag	Coverage Δ
unittests	78.06% <87.50%> (-0.07%)	⬇️

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