Sort buffered transactions

[ashu26jha]

Implements #903, sorting the buffered txns in the increasing contract addresses. They do give slightly better benchmarking results

Benchmarks from the main branch:

ashutoshjha@Ashutoshs-MacBook-Air juno % go test ./... -bench=MainnetBlock -benchmem
PASS
ok      github.com/NethermindEth/juno/adapters/sn2core  0.920s

Benchmarks from current branch

ashutoshjha@Ashutoshs-MacBook-Air juno % go test ./... -bench=MainnetBlock -benchmem
PASS
ok      github.com/NethermindEth/juno/adapters/sn2core  0.727s

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.42%. Comparing base (10ba647) to head (670fb66).

Files	Patch %	Lines
core/state.go	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1882      +/-   ##
==========================================
+ Coverage   75.40%   75.42%   +0.01%     
==========================================
  Files         100      100              
  Lines        8983     8990       +7     
==========================================
+ Hits         6774     6781       +7     
  Misses       1605     1605              
  Partials      604      604              

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