[POC] Add a GrowingByteBuffer for VFS implementations #77

Job	Run time
Compile sqlite3 for windows-latest	12s
Compile sqlite3 for ubuntu-latest	9s
Compile sqlite3 for macos-latest	7s
Analyze on Dart stable	29s
Unit tests with Dart stable on ubuntu-latest	2m 9s
Unit tests with Dart dev on ubuntu-latest	1m 58s
Unit tests with Dart stable on windows-latest	49s
Unit tests with Dart dev on windows-latest	1m 22s
Unit tests with Dart stable on macos-latest	44s
Unit tests with Dart dev on macos-latest	1m 1s
integration_test_linux	1m 33s
integration_test_macos	0s
integration_test_ios	0s
	10m 33s

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