Properly escape property name and values when dumping app config

[aloubyansky]

Discovered by trying to load a config dump with property names containing :. This change makes it compatible with how Properties are persisted to a file.

[quarkus-bot]

Failing Jobs - Building 9d5a925

Status	Name	Step	Failures	Logs	Raw logs
✖	JVM Tests - JDK 11	Build	⚠️ Check →	Logs	Raw logs
✔️	JVM Tests - JDK 17
✖	JVM Tests - JDK 17 Windows	Build	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 20
✖	Native Tests - Security2	Update Docker Client User Agent	⚠️ Check →	Logs	Raw logs

Full information is available in the Build summary check run.

Failures

⚙️ JVM Tests - JDK 17 Windows #

- Failing: integration-tests/rest-client-reactive 

📦 integration-tests/rest-client-reactive

✖ io.quarkus.it.rest.client.selfsigned.ExternalSelfSignedTestCase.should_accept_self_signed_certs line 16 - More details - Source on GitHub

java.net.SocketTimeoutException: Read timed out
	at java.base/sun.nio.ch.NioSocketImpl.timedRead(NioSocketImpl.java:288)
	at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:314)