feat: add note length check on note creation

This check throws a MaximumDocumentLengthExceededError, if the configured maxDocumentLength is exceeded by the new note

Signed-off-by: Philip Molares <philip.molares@udo.edu>

src/errors/errors.ts

@@ -55,3 +55,7 @@ export class NoLocalIdentityError extends Error {
 export class PasswordTooWeakError extends Error {
   name = 'PasswordTooWeakError';
 }
+
+export class MaximumDocumentLengthExceededError extends Error {
+  name = 'MaximumDocumentLengthExceededError';
+}