feat: restrict TIP-20 fee token inference to transfer operations only

[varun-doshi]

Fixes #1373

[vercel[bot]]

@varun-doshi is attempting to deploy a commit to the Tempo Team on Vercel.

A member of the Team first needs to authorize it.

[jenpaff]

Thanks for your contribution ! this is time-sensitive so we'll take it over ourselves. We'll open specific github issues for external contributors