Allow a default color_formula to be defined on the factory

[samn]

instead of needing it to be passed through query params.

What I am changing

• Add a color_formula_dependency field to BaseTilerFactory & MosaicTilerFactory (defaulting to the existing ColorFormulaParams) so users can override the logic for supplying a color formula. This lets us define a default color formula from a separate config without needing to include it in the query params for every request.

How I did it

• Added a dependency to get the color_formula value, rather than using a Query directly that can't be overridden.

How you can test it

• Via the integration tests, or by using the color_formula_dependency in an existing application.

[vincentsarago]

Thank you @samn 🙏