Introspection and Debugging

[andyl]

Add features to help users introspect and debug.

Matching Introspection:

• match - show elements that have matching statements
• overlap - show elements that have overlapping maturation ranges
• align - show elements that have aligning prices

These introspections should apply for the following element combinations:

• Contract -> Contract
• Contract -> Offer
• Offer -> Offer
• Offer -> Contract

Cross Introspection:

• show crossing price
• show crossing volume
• show crossing maturation date

The 'cross introspection' is a sort of "dry run" to see how the cross would work without applying the changes.

Update the CLI:

• [x] drop bmx series
• [ ] bmx contract cross UUID --dry-run
• [ ] bmx contract offers --match --overlap --align --open
• [ ] bmx contract peers --match --open
• [ ] bmx offer contracts --match --overlap --open
• [ ] bmx offer peers --match --overlap --align --open