Use stored tavily results as a cache

[evangriffiths]

Follow-on from https://github.com/gnosis/prediction-market-agent-tooling/pull/337

Motivation is to save tavily credits.

instead of tavily_search should take some extra arg (or maybe fold intit args of TavilyStorage) to configure when how to search saved results for a cache hit, otherwise do a new search.

[evangriffiths]

Depends on https://github.com/gnosis/prediction-market-agent/pull/381

[kongzii]

So far, it doesn't look like there is much to get from cache, but agents were bugging out because of insufficient database instance, so I'll check again at the end of the week:

[kongzii]

Based on this SQL

select sum(count) from (
    SELECT 
        COUNT(DISTINCT agent_id) AS unique_agent_count,
        query,
        count(*) as count
    FROM tavily_response
    group by query
    having count(*) > 1
) as X;

Out of 1317 records, 151 could come from the cache, that's 11%.

That's not bad, but I expected more.

We have 18k credits left this month, and it's only a week to the end; I'd revert the agents to be executed more often, and let's see what it does.

[kongzii]

Added to PMAT in https://github.com/gnosis/prediction-market-agent-tooling/pull/380/files and because we already provide TavilyStorage everywhere, it will come from cache if possible.