Add uSPAC5 as price identifier and uSPAC5_FR as funding rate identifier

A synthetic token that tracks the index of the 5 most active SPACs stocks can be used for speculative purposes and allows the user to earn on price movements in one of the most interesting markets without centralized intermediaries such as exchanges and brokers.
In addition, that token can be used as components associated with classical markets by other DeFi and DApp protocols, which makes it possible to scale.


After discussions and disputes, we decided to refocus on creating a synthetic token (perpetual) that tracks the index value. Here is a link to the intended approach: