Trajectory search to use ANISE's ScalarExpr

[ChristopherRabotin]

Maintenance task description

Recycling this task to change the event finding to use ANISE's ScalarExpr expression tree builder, cf https://github.com/nyx-space/anise/pull/519 . The Brent solver in ANISE is the same as the one in Nyx, but the complication is finding event arcs, and that is now validated in ANISE.

Scope of work

This may require changes to ANISE to either make the ScalarExpr generic or to allow loading a Nyx trajectory into the Almanac prior to searching.

Priority

• Low