Use `denormalized.trees` table to implement the routers under `/species`

We are using public.trees to query data for /species but it is slow, we now created a new table to denormalize the data to get higher performance, so please use the new table to implement this API again.

Some notes:

• Prerequisite: https://github.com/Greenstand/treetracker-denormalization/issues/1
• Please checkout the denormalized branch to work on and to create pull request.
• More details about denormalization is here

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