feat(prx): declare exports for 66 inventory-covered system libraries

docs/dev/debt/libSceDtsEnc.md

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+# libSceDtsEnc technical debt
+
+### Unknown function info
+
+- [sceDtsEncCreateEncoder, sceDtsEncDeleteEncoder, sceDtsEncEncode, sceDtsEncEncodeAsync, sceDtsEncFlush, sceDtsEncIsEncoding and sceDtsEncWaitEncode](../../../core/libs/prx/libSceDtsEnc/Export.cpp) (libSceDtsEnc) - names and NIDs are present in the [PS5 3.20 export inventory](https://github.com/DNNDHH/PS5-3.20_Libs/blob/b2a77c09cd71c01f34c790cfbe98c751a13262ad/libSceDtsEnc.c), but no credible prototypes were found. The declarations have no parameters solely to resolve known imports; this is not an ABI claim and callers must not call them until signatures are verified