chore(markdown): export utils of customComponentPlugin

Author: meteorlxy

Diff for: packages/@vuepress/markdown/src/plugins/customComponentPlugin/index.ts

@@ -1,4 +1,6 @@
 export * from './customComponentPlugin'
 export * from './htmlBlockRule'
+export * from './htmlInlineRule'
+export * from './htmlRe'
 export * from './inlineTags'
 export * from './vueReservedTags'