add version function and use it in pg_dump_anon

Yann ROBINrequested to merge
me.show/postgresql_anonymizer:pg_dump_ano_dbaas into master

Hello,

As discused in #128 (closed) this request removed the check on extension installation and create a new function to send version. Version should be upgrade on each release, or it should be set through Makefile (I'm really really rusty in Makefile)

Thanks

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