(Contracts) Consolidate events 1: wrap OB entry points

[memarin]

Sub Task 1:

🏗️ The [functions that need to be wrapped]by the vault are:

• place_bid
• update_bid
• refund_unused_bids
• exercise_options
• mint_options

This means each function (similarly to start_auction/end_auction/settle_round) should only allow the vault to call them. This means ALL WRITE FUNCTIONS will assert the caller is the vault.