feat: update terminal-fi-predeposit TVL methodology

[DevTerminalFi]

This PR is a generalization of #16741 that computes terminal-fi-predeposit TVL based on the receipt tokens total supply & the DefiLlama pricing of those tokens.

This implementation is directly inspired by the way Midas compute their TVL.

IMPORTANT :

Before considering merging this PR, the DefiLlama pricing of tUSDe (0xA01227A26A7710bc75071286539E47AdB6DEa417) must be corrected. It is currently considered 1:1 with sUSDe, but in reality it is 1:1 with USDe.

[llamabutler]

The adapter at projects/terminal-fi-predeposit exports TVL:

ethereum                  319.47 M

total                    319.47 M 

[waynebruce0x]

Why cant we continue counting the value of the token balances?

[DevTerminalFi]

For security and accounting reasons, we prefer not to mix different assets within vaults that were initially designed to hold a single underlying.

In addition, computing TVL based on the receipt token supply is more future-proof: it remains valid regardless of where the underlying assets are held, whether directly in the vaults or later in the AMM (as will be the case post-launch).