[PLAT-4049] Extracted visitor from CurveNodeToDefinitionConverter
[PLAT-4038] Adding future price curve functions to the repository
[PLAT-4049] Removing fixings for swaps for the moment
[PLAT-4049] Added a builder for curve node visitors and used it to split up the curve node converter into smaller units
[PLAT-4049] Added a builder for curve node visitors and used it to split up the curve node converter into smaller units