Refactor existing native composite values to use 'CompositeValue'

[SupunS]

Closes #650
Closes #661

Description

Currently, native composite values and types (e.g. AuthAccount, AuthAccount.Contracts, PublicAccount, etc.) are defined through separate Go types implementing the Value interface (e.g. AuthAccountValue) and Type interface (e.g. AuthAccountType).

This PR refactor those existing values and types to use CompositeValue and CompositeType respectively.

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[SupunS]

Seems this PR has way too many conflicts to rebase. Hence opened a separate PR: #698