Add Multiple Security Rule Checks for DeFi Projects

[BradMoonUESTC]

Over the past year, I've developed several security rule checks specifically designed for DeFi projects, and I believe these will greatly enhance Slither's capabilities in identifying potential security risks within smart contracts. This contribution includes a variety of checks, such as:

1. AMM k-Value Error Check: Validates the correctness of the k-value within AMM contracts to prevent manipulation or unintended behavior.
2. Price Manipulation Check: Identifies potential vectors for price manipulation within DeFi protocols, ensuring integrity in pricing mechanisms.
3. DeFi Behavior Nesting Check: Detects complex nesting of DeFi behaviors that could lead to unforeseen vulnerabilities or centralization risks.
4. Centralization Risk Check: Highlights areas within the contract code that may introduce centralization, which is contrary to the fundamental principles of DeFi.
5. Front-Running Vulnerability Check: Aims to uncover potential vulnerabilities that could allow for front-running attacks, protecting users from exploitation.

In addition to the rule checks, I have included comprehensive test cases for each to facilitate thorough evaluation and integration.

I understand that these contributions may require extensive discussion, possible code optimization, and additional descriptive documentation. I'm fully prepared to engage in these discussions and make necessary adjustments. Furthermore, I have compiled a set of summary documents and thought processes behind these rule developments, which I'm happy to share upon request. These documents could provide valuable insights into the rationale and methodology of the rule checks.

This effort aligns with the ongoing initiative to open-source more rules as part of the MetaTrustLabs Falcon project, and I believe it would be beneficial to include these checks in Slither as part of a collaborative push towards enhancing smart contract security.

Looking forward to your feedback and the opportunity to discuss these contributions further.

BradMoonUESTC

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[0xalpharush]

Hey, we'd like to upstream high quality detectors and any improvements in the false positive rate but it is a bit difficult to review such large PR's. Would you please curate detectors you'd like to upstream and provide the motivation with examples (similar to what we'd include in the wiki?

[BradMoonUESTC]

Hey, we'd like to upstream high quality detectors and any improvements in the false positive rate but it is a bit difficult to review such large PR's. Would you please curate detectors you'd like to upstream and provide the motivation with examples (similar to what we'd include in the wiki?

Sure, will provide relavant information in next few weeks