Add sdtc:specialty and sdtc:expirationTime

[benjaminflessner]

https://jira.hl7.org/browse/CDA-21424

Creates a simple CE-type element on 4 fields for specialty. Example usage:

<author>
    <time value="20250113"/>
    <assignedAuthor>
        <id root="2.16.840.1.113883.4.6" extension="1234567890"/> <!-- NPI -->
        <code code="207Q00000X"
              codeSystem="2.16.840.1.113883.6.101"
              displayName="Family Medicine"/>
        <sdtc:specialty code="419772000"
                        codeSystem="2.16.840.1.113883.6.96"
                        displayName="Family practice"/>
        <assignedPerson>
            <name>
                <given>John</given>
                <family>Doe</family>
            </name>
        </assignedPerson>
    </assignedAuthor>
</author>

https://jira.hl7.org/browse/CDA-21333

Adds <expirationTime> after lotNumberText on Material. DataType is IVL_TS, though the most common usage will be a single timestamp:

<manufacturedProduct classCode="MANU">
  <templateId root="2.16.840.1.113883.10.20.22.4.54"/>
  <templateId root="2.16.840.1.113883.10.20.22.4.54" extension="2014-06-09"/>
  <manufacturedMaterial>
    <code code="20" codeSystem="2.16.840.1.113883.12.292" codeSystemName="CVX" displayName="Infanrix" />
    <lotNumberText nullFlavor="UNK"/>
    <sdtc:expirationTime value="20251231" />
  </manufacturedMaterial>
</manufacturedProduct>