[Add] IEquatable to Signer

[cschuchardt88]

Change Log

• Added IEquatable to Signer class
• Added Unit Tests for IEquatable on Signer class

Needs #3573

Type of change

• Optimization (the change is only an optimization)
• Style (the change is only a code style for better maintenance or standard purpose)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Test_IEquatable

Test Configuration:

• Unit Tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[shargon]

== null already done in is sentence

[cschuchardt88]

== checks for null and sends to this method.

[shargon]

Serialize the object for compare seems very weird, and slow, i will fix it tomorrow

[nan01ab]

Serialize the object for compare seems very weird, and slow, i will fix it tomorrow

What is serialized？

AllowedContracts and AllowedGroups are array.

[cschuchardt88]

Serialize the object for compare seems very weird, and slow, i will fix it tomorrow

Span is faster and we don't have to check for null.

addressed