Understanding Flashloan and its application

## Summary
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Flash loan differs from traditional loan by not requiring the deposit of collateral, and it can borrow a large amount of asset within a single transaction. It is a powerful and innovative DeFi application, what is the current usage of flash loan? How to implement such application?

## Description
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EIP-3156 outline the flash loan implementation details, but not all the protocol that support flash loan follows the rules. There are many protocol that support such feature, such as DYDX, Uniswap, Aave, DoDo Finance, Ion Bank and more. What are the differences and similarities among these protocol and their flash loan implementations?

Based on academic research, flash loan is currently been applied to arbitrage, liquidation, collateral swap, and wash trading activities, you might check if there is related statistics on the Dune dashboard.

## Source
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[Towards A First Step to Understand Flash Loan and Its Applications in DeFi Ecosystem](https://dl.acm.org/doi/10.1145/3457977.3460301)

[Understanding Flash-Loan-based Wash Trading](https://dl.acm.org/doi/10.1145/3558535.3559793)

[Optimal Flash Loan Fee Function with Respect to Leverage Strategies
](https://dl.acm.org/doi/10.5555/3635637.3663050)

[FlashSyn: Flash Loan Attack Synthesis via Counter Example Driven Approximation](https://dl.acm.org/doi/10.1145/3597503.3639190)

## Others
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