[Merged by Bors] - feat: natDegree_sub_C #7776
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Adds `degree_sub_C, natDegree_sub_C`, analogous to `..._add_C`. Also relocates `C_neg` and `C_sub` to `Basic.lean` (where `C_add` is) so that the new lemmas can be in the same file as their `add` counterparts.
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Adds
degree_sub_C, natDegree_sub_C, analogous to..._add_C.Also relocates
C_negandC_subtoBasic.lean(whereC_addis) so that the new lemmas can be in the same file as theiraddcounterparts.