Add SwiftPM build for sqlite3_flutter_libs #556

Job	Run time
Compile sqlite3 for windows-latest	13s
Compile sqlite3 for ubuntu-latest	6s
Compile sqlite3 for macos-latest	8s
Analyze on Dart stable	41s
Unit tests with Dart stable on ubuntu-latest	2m 10s
Unit tests with Dart dev on ubuntu-latest	1m 49s
Unit tests with Dart stable on windows-latest	1m 26s
Unit tests with Dart dev on windows-latest	57s
Unit tests with Dart stable on macos-latest	37s
Unit tests with Dart dev on macos-latest	57s
integration_test_ios	21m 34s
integration_test_linux	2m 11s
integration_test_macos	0s
	32m 49s

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