fix linux build by importing GRDBSQLite

saw that the linux build failed and wondered if we
should rely on the GRDBSQLite package instead of raw SQLite3.

From what I understand, that should resolve to SQLite3 on Darwin,
but use libsqlite3 on Linux.

Also copied over the Linux pieces from [swift-sharing](https://github.com/pointfreeco/swift-sharing/blob/main/.github/workflows/ci.yml)
+ installing sqlite

Author: diederich

.github/workflows/ci.yml

@@ -27,3 +27,20 @@ jobs:
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
       - name: Run ${{ matrix.config }} tests
         run: swift test -c ${{ matrix.config }}
+
+  linux:
+    name: Linux
+    strategy:
+      matrix:
+        swift:
+          - '6.0'
+    runs-on: ubuntu-latest
+    container: swift:${{ matrix.swift }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Build Dependencies
+        run: |
+          apt-get update
+          apt-get install -y libsqlite3-dev
+      - name: Build
+        run: swift build

Sources/StructuredQueriesGRDBCore/QueryCursor.swift

@@ -1,6 +1,6 @@
 import Foundation
 import GRDB
-import SQLite3
+import GRDBSQLite
 import StructuredQueriesCore
 
 /// A cursor of a structured query.

Sources/StructuredQueriesGRDBCore/SQLiteQueryDecoder.swift

@@ -1,4 +1,4 @@
-import SQLite3
+import GRDBSQLite
 import StructuredQueriesCore
 
 @usableFromInline

Sources/StructuredQueriesGRDBCore/Statement+GRDB.swift

@@ -1,5 +1,5 @@
 import GRDB
-import SQLite3
+import GRDBSQLite
 import StructuredQueriesCore
 
 extension StructuredQueriesCore.Statement {