Auto-collect extension dependencies and add ignoreExtensions

[ryukzak]

Renames

• ProfileExtension.valueTypes → valueFieldTypes
• ExtensionSubField.valueType → valueFieldType

Auto-collect extension dependencies

• Add profile?: ProfileIdentifier field to ProfileExtension, resolved from extension canonical URL
• Add extractExtensionDeps helper that collects all dependency identifiers from a profile extension (value field types, profile identifier, sub-extension value types)
• Fix incorrect package metadata on sub-extension identifiers: use buildFieldType instead of manually constructing identifiers with wrong package info
• Use extractExtensionDeps in transformer and tree shake to auto-collect extension definition schemas as dependencies

ignoreExtensions tree shake rule

• Add ignoreExtensions?: string[] to TreeShakeRule for excluding specific extensions from a profile by canonical URL
• Recalculate dependencies after filtering so ignored extension deps are excluded

Generation config changes

Extension definitions used by profiles are now included automatically — no need to list them manually in tree shake config.

Before:

treeShake: {
    "hl7.fhir.us.core": {
        "http://.../us-core-patient": {},
        "http://.../us-core-blood-pressure": {},
        "http://.../us-core-body-weight": {},
        "http://.../us-core-ethnicity": {},
        "http://.../us-core-race": {},
        "http://.../us-core-tribal-affiliation": {},
        "http://.../us-core-individual-sex": {},
        "http://.../us-core-interpreter-needed": {},
    },
}

After:

treeShake: {
    "hl7.fhir.us.core": {
        "http://.../us-core-patient": {},
        "http://.../us-core-blood-pressure": {},
        "http://.../us-core-body-weight": {},
    },
}