sql: add array of JSON type to pre-constructed types

[xinhaoz]

This commit adds the JSONArray type to the preconstructed list of types
for use in bultin function definition.

Release note: None

[cockroach-teamcity]

This change is 

[rafiss]

nice, thanks! I think this might fix the error that came up here #74078 (comment)

[rafiss]

lgtm after fixing nits

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @rafiss and @xinhaoz)

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-- commits, line 4 at r1:
nit: typo in preconstructed

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docs/generated/sql/functions.md, line 328 at r1 (raw file):

<tr><td><a name="crdb_internal.merge_statement_stats"></a><code>crdb_internal.merge_statement_stats(input: jsonb[]) &rarr; jsonb</code></td><td><span class="funcdesc"><p>Merge an array of roachpb.StatementStatistics into a single JSONB object</p>
</span></td></tr>
<tr><td><a name="crdb_internal.merge_transaction_stats"></a><code>crdb_internal.merge_transaction_stats(input: anyelement[]) &rarr; jsonb</code></td><td><span class="funcdesc"><p>Merge an array of roachpb.TransactionStatistics into a single JSONB object</p>

i think you need to run make buildshort to update these auto generated docs

[THardy98]

Reviewed 2 of 3 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @xinhaoz)

LGTM :)

[xinhaoz]

TFTR!
bors r+

[craig]

Build succeeded:

• GitHub CI (Cockroach)