feat: covenants implementation

[sdbondi]

Description

• Implementation of Covenants as per RFC-0250
• Implement consensus encoding for some common types
• remove wrapper for consensus encoding tari script, just implement on the type
• add consensus encoding impl for some common types

Motivation and Context

let covenant = covenant!(and(
    field_eq(
        @field::commitment, 
        @commitment(x),
    ), 
    fields_preserved(
        @fields(@field::features_unique_id, @field::features_parent_public_key)
    ))
);
covenant.execute(...)?;

Adding Covenants to inputs/outputs structs and validation is left for another PR - this is not a breaking change.

How Has This Been Tested?

Many new unit tests

[delta1]

Nice looks really great, just one possible off-by-1 in the range otherwise LGTM

[delta1]

🖇