PostgREST / pg_csv / 16818049236

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feat: add BOM option to csv_agg

Support for BOM, requested on https://github.com/PostgREST/postgrest/issues/1371#issuecomment-519248984.

```sql
select csv_agg(x, csv_options(bom := true)) from projects x;
      csv_agg
-------------------
id,name,client_id+
 1,Windows 7,1    +
 2,Windows 10,1   +
 3,IOS,2          +
 4,OSX,2          +
 5,Orphan,
(1 row)
```

Also possible to do with [media type handlers](https://docs.postgrest.org/en/v12/references/api/media_type_handlers.html#overriding-a-builtin-handler),
but it's more convenient to have it builtin.

7 of 7 new or added lines in 1 file covered. (100.0%)

93 of 96 relevant lines covered (96.88%)

86.91 hits per line