Give a way to control if the decidable-equality schemes are built like

in 8.4 with the schemes of the subcomponent of an inductive added to
the environment or discharged as let-ins over the main scheme.

As of today, decidable-equality schemes are built when calling
vernacular command (Inductive with option Set Dedicable Equality
Schemes, or Scheme Equality), so there is no need to discharge the
sub-schemes as let-ins. But if ever the schemes are built from within
an opaque proof and one would not like the schemes and a fortiori the
subschemes to appear in the env, the new addition of a parameter
internal_flag to "find_scheme" allows this possibility (then to be set
to KernelSilent).

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