proposal(json,csv): avoid repetition in entrypoint name if it has the same word as the pacakge name in the beginning

[kt3k]

In addition to #5162, the core team suggests the below entrypoint name changes to make the rule more consistent across std.

• std/csv/csv-parse-stream -> std/csv/parse-stream
• std/csv/csv-stringify-stream -> std/csv/stringify-stream
• std/json/json-parse-stream -> std/json/parse-stream
• std/json/json-stringify-stream -> std/json/stringify-stream

What do you think?

[kt3k]

Should we also do the rename of @std/json/concatenated-json-parse-stream -> @std/json/concatenated-parse-stream?

context: https://github.com/denoland/deno_std/pull/5173#discussion_r1658192661