fix(sdk): export DirectusComment type in schema index (#24528)

* fix(sdk): export DirectusComment type in schema index

The DirectusComment type was missing from the exports in `sdk/src/schema/index.ts`.  
This commit adds the missing export to make the type available for import.  

Closes #24526

* chore: sign CLA by adding @sidartaveloso to contributors list

contributors.yml

@@ -199,3 +199,4 @@
 - ukmadlz
 - obafemitayor
 - highvibesonly
+- sidartaveloso

sdk/src/schema/index.ts

@@ -1,6 +1,7 @@
 export * from './access.js';
 export * from './activity.js';
 export * from './collection.js';
+export * from './comment.js';
 export * from './core.js';
 export * from './dashboard.js';
 export * from './extension.js';