Add CI trigger scripts to run tests when new commits are added to bdk-ffi

[thunderbiscuit]

This should be easy to add since we have done it for bdk-jvm.

Corresponding scripts are here on the JVM side and here on the bdk-ffi side. The bdk-ffi script simply needs to be updated to also call a corresponding bdk-python CI run.

This makes it so that new commits merged to master on bdk-ffi trigger the CI runs here, and we'll get reports if anything upstream is breaking the library here.