CAMEL-23669: camel-hl7 - Support converting to XML

[igarashitm]

Description

Support ER7<>XML direct convertion by leveraging HAPI XML capability.

Target

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Tracking

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  https://issues.apache.org/jira/browse/CAMEL-23669

Apache Camel coding standards and style

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• I have run mvn clean install -DskipTests locally from root folder and I have committed all auto-generated changes.

[davsclaus]

Nice in my old days in health care then XML was emerging but nobody every adapted it - but glad to see that it may be adapoted now and we in Camel can support that.

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• catalog/camel-catalog
• components/camel-hl7
• core/camel-core-model
• core/camel-xml-io
• core/camel-yaml-io
• dsl/camel-yaml-dsl/camel-yaml-dsl-deserializers
• dsl/camel-yaml-dsl/camel-yaml-dsl

ℹ️ Dependent modules were not tested because the total number of affected modules exceeded the threshold (50). Use the test-dependents label to force testing all dependents.

Build reactor — dependencies compiled but only changed modules were tested (7 modules)

• Camel :: Catalog :: Camel Catalog
• Camel :: Core Model
• Camel :: HL7
• Camel :: XML IO
• Camel :: YAML DSL
• Camel :: YAML DSL :: Deserializers
• Camel :: YAML IO

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