chore: release pumpkin-solver 0.2.0

:robot: I have created a release beep boop

adding synchronisation for the cumulative constraint (#86) (5ef9d56)
allow logging of statistics to arbitrary writers (#73) (136e03a)
implement consistency check interface in linear less than propagator (#87) (089a083)
incremental backtracking for the cumulative constraint (#60) (571f99f)
introduce inference-nogoods in drcp-format (#98) (e5ae6c2)

complete proof when propagator initialization identifies root-level conflict (#80) (2ecfe4d)
cumulative holes in domain incorrectly used cached profile (#109) (4c86a8b)
cumulative sequence generation found less profiles than it should + fixing issues with debug propagation (#110) (f17222d)
do not print intermediate solution when flag is not set + solution callback for satisfaction problems (#77) (e853d05)
ensure drcp-format version is the published one (#101) (2f6df0c)
float stat into one line (#83) (d0c459d)
issue with time-point ending up between profiles for pointwise sequence explanation (#78) (2fcb011)
take ownership of the propagation context in propagators (#85) (13f44a0)
use propagate for "<=" constraint + using solution reference from solution rather than solver (#108) (668bd0d)
wrong profile found for over-interval conflict explanation (#111) (4ba1d50)

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