[SERVICES-2465] Fix tokens previous 7 days price

[mad2sm0key]

Reasoning

• the previous7dPrice field on the EsdtToken model is currently returning 0 for all tokens
• sorting by 7 days price change is required by the front-end

Proposed Changes

• fix getLatestCompleteValues timescaledb query (it should use a subquery when start or time parameters are provided)
• add compute method for price change over the last 7 days
• add sorting by the price change over 7 days to filteredTokens query

How to test

• Query should correctly order the tokens, and the field previous7dPrice should have non-zero values on core tokens

query {
  filteredTokens(
    filters:{}
    pagination:{
      first:200
    }
    sorting: {
      sortField:PRICE_CHANGE_7D
      sortOrder:DESC
    }
  ) {
    edges {
      cursor
      node {
        identifier
        price
        previous7dPrice
      }
    }
    pageInfo {
      startCursor
      endCursor
    }
    pageData {
      count
      limit
      offset
    }
  }
}

[cfaur09]

tested 🟢