fix: disable trust provider for PostGres db

[swizzmagik]

Relates to:

• Issues reported by using of crashes due to this error Error in trust score provider: Cannot read properties of undefined (reading 'prepare')

Risks

• low risk

Background

• Many users in discord have reported this error when using the Solana plugin and PostGres db. The trust provider tries to run but fails because the TrustScoreDatabase only works with Sqllite.

What does this PR do?

• Prevents the error from occurring by adding a check for Postgres and logging a warning instead of crashing

What kind of change is this?

• bug fix

Why are we doing this? Any context or related work?

• Allow users of PostGres to utilize Solana and Starknet plugin

Documentation changes needed?

• No

Testing

• Set up a PostGres Connection
• Activate the Solana plugin
• Ask the agent questions about recommendations such as 'Should I buy SOL?'

BEFORE

Error in trust score provider: Cannot read properties of undefined (reading 'prepare')

AFTER

skipping trust evaluator because db is postgres

[odilitime]

well it's better than what we have, but much rather see postgres support

[swizzmagik]

This should be a simple fix and will unblock some folks with further development.