Merge bitcoin/bitcoin#28113: kernel: Remove UniValue from kernel library

6960c81cbf kernel: Remove Univalue from kernel library (TheCharlatan)
10eb3a9faa kernel: Split ParseSighashString (TheCharlatan)

Pull request description:

  Besides the build system changes, this is a mostly move-only change for moving the few UniValue-related functions out of kernel files.

  UniValue is not required by any of the kernel components and a JSON library should not need to be part of a consensus library.

ACKs for top commit:
  achow101:
    ACK 6960c81cbf
  theuni:
    Re-ACK 6960c81cbf
  stickies-v:
    re-ACK 6960c81cbf

Tree-SHA512: d92e4cb4e12134c94b517751bd746d39f9b8da528ec3a1c94aaedcce93274a3bae9277832e8a7c0243c13df0397ca70ae7bbb24ede200018c569f8d81103c1da

src/test/fuzz/parse_univalue.cpp

@@ -3,7 +3,6 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <chainparams.h>
-#include <core_io.h>
 #include <rpc/client.h>
 #include <rpc/util.h>
 #include <test/fuzz/fuzz.h>
@@ -57,12 +56,6 @@ FUZZ_TARGET(parse_univalue, .init = initialize_parse_univalue)
         (void)ParseHexO(univalue, random_string);
     } catch (const UniValue&) {
     }
-    try {
-        (void)ParseHexUV(univalue, "A");
-        (void)ParseHexUV(univalue, random_string);
-    } catch (const UniValue&) {
-    } catch (const std::runtime_error&) {
-    }
     try {
         (void)ParseHexV(univalue, "A");
     } catch (const UniValue&) {
@@ -75,7 +68,7 @@ FUZZ_TARGET(parse_univalue, .init = initialize_parse_univalue)
     }
     try {
         (void)ParseSighashString(univalue);
-    } catch (const std::runtime_error&) {
+    } catch (const UniValue&) {
     }
     try {
         (void)AmountFromValue(univalue);