Add missing LinearVerbosity imports to extensions

Several extensions were using LinearVerbosity in their function signatures
but were not explicitly importing it. This commit adds the missing imports
to ensure proper functionality:

- LinearSolveIterativeSolversExt: Added LinearVerbosity to imports
- LinearSolveFastLapackInterfaceExt: Added LinearVerbosity import
- LinearSolvePardisoExt: Added LinearVerbosity to imports
- LinearSolveSparspakExt: Added LinearVerbosity import

These imports are necessary as LinearVerbosity is used as a type annotation
in the init_cacheval functions of these extensions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: claude

ext/LinearSolveFastLapackInterfaceExt.jl

@@ -1,6 +1,7 @@
 module LinearSolveFastLapackInterfaceExt
 
 using LinearSolve, LinearAlgebra
+using LinearSolve: LinearVerbosity
 using FastLapackInterface
 
 struct WorkspaceAndFactors{W, F}

ext/LinearSolveIterativeSolversExt.jl

@@ -1,7 +1,7 @@
 module LinearSolveIterativeSolversExt
 
 using LinearSolve, LinearAlgebra
-using LinearSolve: LinearCache, DEFAULT_PRECS
+using LinearSolve: LinearCache, DEFAULT_PRECS, LinearVerbosity
 import LinearSolve: IterativeSolversJL
 using SciMLLogging: @SciMLMessage, Verbosity
 

ext/LinearSolvePardisoExt.jl

@@ -3,7 +3,7 @@ module LinearSolvePardisoExt
 using Pardiso, LinearSolve
 using SparseArrays
 using SparseArrays: nonzeros, rowvals, getcolptr
-using LinearSolve: PardisoJL, @unpack
+using LinearSolve: PardisoJL, @unpack, LinearVerbosity
 using SciMLLogging: @SciMLMessage, verbosity_to_bool
 using LinearSolve.SciMLBase
 

ext/LinearSolveSparspakExt.jl

@@ -1,6 +1,7 @@
 module LinearSolveSparspakExt
 
 using LinearSolve, LinearAlgebra
+using LinearSolve: LinearVerbosity
 using Sparspak
 using Sparspak.SparseCSCInterface.SparseArrays
 using SparseArrays: AbstractSparseMatrixCSC, nonzeros, rowvals, getcolptr