Linstor: support live migration from other primary storage (apache#12532)

* Linstor: Refactor resource creation methods to LinstorUtil

Move reusable methods from LinstorPrimaryDataStoreDriverImpl to LinstorUtil
to enable sharing with other components:
- logLinstorAnswer, logLinstorAnswers, checkLinstorAnswersThrow
- getRscGrp, getEncryptedLayerList, applyQoSSettings
- createResourceBase, createResource, spawnResource
- canShareTemplateForResourceGroup, foundShareableTemplate

Add LIN_PROP_DRBDOPT_EXACT_SIZE constant and exactSize parameter support
for DRBD exact-size property handling during resource creation.

* Linstor: Add LinstorDataMotionStrategy for VM live migration

Implement DataMotionStrategy for live migration of VMs with volumes on
Linstor or other primary storage.

Key features:
- Support live migration with storage from other primary storages
- Preserve DRBD exact-size property during migration

Author: rp-

plugins/storage/volume/linstor/CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to Linstor CloudStack plugin will be documented in this file
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2026-01-17]
+
+### Added
+
+- Support live migrate from other primary storage
+
 ## [2025-12-18]
 
 ### Changed