Merge #14491: Allow descriptor imports with importmulti

b985e9c Add release notes for importmulti descriptor support (MeshCollider)
fbb5e93 Add test for importing via descriptor (MeshCollider)
9f48053 [wallet] Allow descriptor imports with importmulti (MeshCollider)
d2b381c [wallet] Refactor ProcessImport() to call ProcessImportLegacy() (John Newbery)
4cac0dd [wallet] Add ProcessImportLegacy() (John Newbery)
a1b25e1 [wallet] Refactor ProcessImport() (John Newbery)

Pull request description:

  ~~Based on #14454 #14565, last two commits only are for review.~~

  Best reviewed with `?w=1`

  Allows a descriptor to be imported into the wallet using `importmulti` RPC. Start and end of range can be specified for ranged descriptors. The descriptor is implicitly converted to old structures on import.

  Also adds a simple test of a P2SH-P2WPKH address being imported as a descriptor. More tests to come, as well as release notes.

Tree-SHA512: 160eb6fd574c4ae5b70e0109f7e5ccc95d9309138603408a1114ceb3c558065409c0d7afb66926bc8e1743c365a3b300c5f944ff18b2451acc0514fbeca1f2b3

Author: laanwj

doc/release-notes-14491.md

@@ -0,0 +1,5 @@
+Descriptor import support
+---------------------
+
+The `importmulti` RPC now supports importing of addresses from descriptors. A "desc" parameter can be provided instead of the "scriptPubKey" in a request, as well as an optional range for ranged descriptors to specify the start and end of the range to import. More information about
+descriptors can be found [here](https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md).