Add explicit instantiation declaration for Values

[bradley-solliday-skydio]

For some reason this was missing (despite the fact that we explicitly instantiate the class in values.cc)

Speculation, but this might be why values.h always takes so long to compile.

Topic: values_explicit_instantiation_declaration

[bradley-solliday-skydio]

Reviews in this chain: └https://github.com/symforce-org/symforce/pull/297 Add explicit instantiation declaration for Values

[bradley-solliday-skydio]

#	head	base	diff	date	summary
0	297d6afd	59753592	diff	Feb 9 20:00 PM	1 file changed, 4 insertions(+)

[aaron-skydio]

Merged into 596e3bc45133f6e88760356081ffd81fdd3aa4bd