[Java] Start to introduce property based testing (PBT).

In this commit, I've:

1. Added a test dependency on JQwik.

2. Added a JQwik-based generator of arbitrary valid SBE message schemas.
   This generator exercises a lot of possibilities but not all.
   In particular, it is missing the generation of constants, min/max,
   and custom offsets.

3. Added a test that shows the parser parses any arbitrary SBE message
   schema.

Why have I introduced PBT? My aim is to eventually test (an
approximation of) the following property:

```
∀ msgSchema ∈ PossibleMessageSchemas,
  ∀ bytes ∈ PossibleValidValues(msgSchema),
    DtoEncode(DtoDecode(bytes)) = bytes
```

I.e., that `DtoEncode` is the inverse of `DtoDecode` and that it
preserves the information in an encoded message.

Author: ZachBray

.gitignore

@@ -114,4 +114,7 @@ rust/Cargo.lock
 .DS_Store
 /sbe-tool/src/main/golang/uk_co_real_logic_sbe_ir_generated/
 
+# JQwik
+*.jqwik-database
+
 /generated/

build.gradle

@@ -57,6 +57,7 @@ def checkstyleVersion = '9.3'
 def hamcrestVersion = '2.2'
 def mockitoVersion = '4.11.0'
 def junitVersion = '5.10.0'
+def jqwikVersion = '1.8.0'
 def jmhVersion = '1.37'
 def agronaVersion = '1.19.2'
 def agronaVersionRange = '[1.19.2,2.0[' // allow any release >= 1.19.2 and < 2.0.0
@@ -248,6 +249,7 @@ project(':sbe-tool') {
         testImplementation files('build/classes/java/generated')
         testImplementation "org.hamcrest:hamcrest:${hamcrestVersion}"
         testImplementation "org.mockito:mockito-core:${mockitoVersion}"
+        testImplementation "net.jqwik:jqwik:${jqwikVersion}"
         testImplementation "org.junit.jupiter:junit-jupiter-params:${junitVersion}"
         testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:${junitVersion}"
     }

sbe-tool/src/test/java/uk/co/real_logic/sbe/properties/ParserPropertyTest.java

@@ -0,0 +1,32 @@
+package uk.co.real_logic.sbe.properties;
+
+import net.jqwik.api.Arbitrary;
+import net.jqwik.api.ForAll;
+import net.jqwik.api.Property;
+import net.jqwik.api.Provide;
+import uk.co.real_logic.sbe.xml.ParserOptions;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+
+import static uk.co.real_logic.sbe.xml.XmlSchemaParser.parse;
+
+public class ParserPropertyTest
+{
+    @Property
+    void shouldParseAnyValidSchema(@ForAll("schemas") final SchemaDomain.MessageSchema schema) throws Exception
+    {
+        final String xml = XmlSchemaWriter.writeString(schema);
+        try (InputStream in = new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)))
+        {
+            parse(in, ParserOptions.DEFAULT);
+        }
+    }
+
+    @Provide
+    Arbitrary<SchemaDomain.MessageSchema> schemas()
+    {
+        return SchemaDomain.MessageSchema.arbitrary();
+    }
+}