Replace Attestation Type Primitive With Proto Generated Type

[rauljordan]

This is part of #781

Description

This PR replaces all instances of primitives such as *types.Attestation with its corresponding proto pb.Attestation and pb.AttestationData and also as a Golang struct if they are mostly 1-to-1 (the Go structs only having getters and setters). As such, we will enforce using the proto generated types throughout the repo.

This PR deprecates all instances of AggregatedAttestation

[codecov]

Codecov Report

Merging #1149 into master will decrease coverage by 0.61%.
The diff coverage is 70.27%.

@@            Coverage Diff             @@
##           master    #1149      +/-   ##
==========================================
- Coverage   73.26%   72.64%   -0.62%     
==========================================
  Files          82       82              
  Lines        5158     5111      -47     
==========================================
- Hits         3779     3713      -66     
- Misses       1056     1076      +20     
+ Partials      323      322       -1

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[terencechain]

More deletions than additions. My type of PR 😁
Looks good! Maybe mention you have deprecated AggregatedAtteststion proto in the description