feat: add rw_fragment_parallelism and re-define rw_streaming_parallelism

[yezizp2012]

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What's changed and what's your intention?

As title, changed rw_streaming_parallelism to display job level parallelism info and introduced rw_fragment_parallelism for fragment level. Related #14261 . An example as follows:

dev=> select * from rw_streaming_parallelism;
  id  | name |   relation_type   | parallelism
------+------+-------------------+-------------
 1001 | t    | table             | FIXED(4)
 1002 | mv1  | materialized view | AUTO
 1004 | idx  | index             | AUTO
(3 rows)

dev=> select * from rw_fragment_parallelism;
  id  | name |   relation_type   | fragment_id | distribution_type | state_table_ids | upstream_fragment_ids |        flags        | parallelism
------+------+-------------------+-------------+-------------------+-----------------+-----------------------+---------------------+-------------
 1001 | t    | table             |           2 | HASH              | {}              | {}                    | {SOURCE,DML}        |           4
 1001 | t    | table             |           1 | HASH              | {1001}          | {2}                   | {MVIEW}             |           4
 1002 | mv1  | materialized view |           3 | HASH              | {1003,1002}     | {1}                   | {MVIEW,STREAM_SCAN} |           4
 1004 | idx  | index             |           5 | HASH              | {1005}          | {1}                   | {STREAM_SCAN}       |           4
 1004 | idx  | index             |           4 | HASH              | {1004}          | {5}                   | {MVIEW}             |           4
(5 rows)

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1. Change system view rw_streaming_parallelism to allow query on streaming job parallelism with job name and type.
2. Add system view rw_fragment_parallelism to allow query parallelism info on fragment level, together with some fragment info.

[neverchanje]

Well done. Exactly what I need!