feat: include subject in NATS source

[PierreNowak]

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What's changed and what's your intention?

Ingest additional subject field for NATS source

CREATE source nats_source
INCLUDE subject as subject
WITH (
    connector='nats',
)...

now I have my subject column:

dev=> SELECT subject from nats_mv limit 10;
   subject
-------------
 data.SN0001
 data.SN0001
 data.SN0001
 data.SN0001
 data.SN0001
 data.SN0001
 data.SN0001
 data.SN0001
 data.SN0001
 data.SN0001
(10 rows)

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as describe in title

support additional column dedicated to Nats Connector

CREATE SOURCE/TABLE <name> 
INCLUDE subject 
WITH (connector = 'nats', ...) ...;

subject stands for the message comes from which subject if the stream contains multiple subjects.

[fuyufjh]

The idea LGTM. Please also take a look cc. @tabVersion @xiangjinwu

[tabVersion]

Hi @PierreNowak , I submit a pr to fix the format issue and add nats related E2E test.
PierreNowak#1
Thanks for your contribution.

[tabVersion]

Hi @PierreNowak, can you merge PierreNowak#2 on your branch to merge this one? Thanks