Auto generate table name

[Anish9901]

Fixes #3636

Replicates the current behaviour our table add REST endpoint and generate table name if one isn't provided.

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[seancolsen]

Correct me if I'm wrong, but I think there may be a bug here. Say I begin with zero tables...

1. I create a table. It gets named Table 1.
2. I create another table. It gets named Table 2.
3. I delete the first table.
4. I create a third table. Within this function table_count will be 1 so fq_table_name will be something like public."Table 2". But public."Table 2" already exists so CREATE TABLE will fail.

Right?

[Anish9901]

You are correct @seancolsen, I've fixed the bug and added a test in 0450fbe, thanks for catching it!

[seancolsen]

Cool. I haven't reviewed thoroughly, but your changes look good from a glance. I'll leave it to Brent to review fully.