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Impossible to create an uncompressed QCOW2 disk
Description of problem:
An QCOW2 image is created compressed unconditionally. There is no way to disable compression, albeit the QCOW format specification allows this.
```
$ qemu-img --version
qemu-img version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.12)
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
$ qemu-img create -f qcow2 test.qcow2 1G
Formatting 'test.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=1073741824 lazy_refcounts=off refcount_bits=16
$
```
Same is applicable for 8-x qemu-img version (I built it for testing purposes)
```
$ ./build/qemu-img create -f qcow2 disk.qcow2 1G
Formatting 'disk.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=1073741824 lazy_refcounts=off refcount_bits=16
$ ./build/qemu-img --version
qemu-img version 8.0.90 (v8.1.0-rc0-21-gd1181d2937)
Copyright (c) 2003-2023 Fabrice Bellard and the QEMU Project developers
$
```
Steps to reproduce:
Create a QCOW2 disk with `qemu-img` of never versions.
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