feat: metavault

[carrion256]

closes https://linear.app/templar-protocol/issue/ENG-19/initial-vault-contract

Creates https://linear.app/templar-protocol/issue/ENG-39/recallreallocate

TODO:

• use returnstyle
• gas problems with withdraw
• rephrase withdraw>create, exec>exec

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This change is 

[peer2f00l]

First look. Not comprehensive, and most comments are pretty surface-level. I'm not confident that I have a complete-picture understanding of everything that's going on yet, so we should hop on a call and run through this a few times before we call it good.

[github-actions]

Name	Deployment
Registry	gh-243.templar-in-training.testnet
Default market	default-19295909013.gh-243.templar-in-training.testnet

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Installed near-sandbox into /home/runner/work/contracts/contracts/target/debug/build/near-sandbox-utils-2ad3b5a56a37a3e2/out/.near/near-sandbox-2.8.0/near-sandbox

Gas Report

Snapshot Limits

harvest_yield

Iterations	Gas
0	3.4 Tgas
391	14.9 Tgas

Estimated snapshot limit: 9628

apply_interest

Iterations	Gas
0	3.6 Tgas
391	13.2 Tgas

Estimated snapshot limit: 11494

Action Gas Descriptors

Action	Gas
collateralize	12.5 Tgas
withdraw_collateral	9.4 Tgas
borrow	14.9 Tgas
repay	13.8 Tgas
supply	8.6 Tgas
create_supply_withdrawal_request	3.1 Tgas
execute_next_supply_withdrawal_request	11.4 Tgas

Gas Report

Estimated allocation limit: 0

Action Gas Descriptors

Action	Gas
supply	7.9 Tgas
allocate	19.8 Tgas
withdraw	4.0 Tgas
execute withdraw	9.1 Tgas
submit_cap	2.5 Tgas