Change way to generate implemented functions

[Vedin]

I added a new alias for cargo subcommand to easily update implemented functions.
Also, it fixes cases when some functions don't show up in the datafusion registry (like table functions).
#1061

[github-actions]

SQL Logic Tests Results ❌

Coverage by SLT File

• dateadd: 4/5 (80.0%)
• get_ignore_case: 0/2 (0.0%)
• any_value: 0/1 (0.0%)
• previous_day: 1/1 (100.0%)
• array_union_agg: 1/1 (100.0%)
• add_months: 2/3 (66.7%)
• arrays_overlap: 0/2 (0.0%)
• object_keys: 2/2 (100.0%)
• to_date: 0/9 (0.0%)
• array_intersection: 6/7 (85.7%)
• object_construct_keep_null: 0/2 (0.0%)
• date_from_parts: 3/3 (100.0%)
• array_distinct: 2/3 (66.7%)
• var_samp: 0/1 (0.0%)
• get_path: 1/2 (50.0%)
• timestamp_from_parts: 3/6 (50.0%)
• current_time: 0/3 (0.0%)
• current_warehouse: 0/1 (0.0%)
• regr_slope: 0/1 (0.0%)
• parse_json: 2/8 (25.0%)
• monthname: 2/3 (66.7%)
• percent_rank: 0/1 (0.0%)
• lead: 1/2 (50.0%)
• time_from_parts: 0/2 (0.0%)
• current_schema: 0/1 (0.0%)
• dayname: 2/3 (66.7%)
• is_double-real: 0/2 (0.0%)
• lag: 1/2 (50.0%)
• convert_timezone: 0/3 (0.0%)
• last_value: 0/1 (0.0%)
• object_agg: 1/3 (33.3%)
• current_date: 0/1 (0.0%)
• array_min: 3/4 (75.0%)
• object_insert: 0/8 (0.0%)
• array_prepend: 1/1 (100.0%)
• array_contains: 3/6 (50.0%)
• current_database: 0/1 (0.0%)
• timestampdiff: 0/3 (0.0%)
• to_time: 0/4 (0.0%)
• is_array: 0/3 (0.0%)
• array_append: 0/4 (0.0%)
• is_null_value: 0/1 (0.0%)
• nth_value: 0/1 (0.0%)
• json_extract_path_text: 0/3 (0.0%)
• as_array: 1/1 (100.0%)
• median: 0/2 (0.0%)
• array_max: 3/5 (60.0%)
• array_reverse: 1/1 (100.0%)
• date_part: 0/4 (0.0%)
• max: 4/4 (100.0%)
• dense_rank: 2/2 (100.0%)
• date_trunc: 2/5 (40.0%)
• timeadd: 4/5 (80.0%)
• avg: 0/4 (0.0%)
• last_day: 0/3 (0.0%)
• sum: 1/5 (20.0%)
• object_construct: 1/8 (12.5%)
• to_variant: 0/2 (0.0%)
• timestampadd: 4/5 (80.0%)
• min: 3/4 (75.0%)
• ntile: 0/1 (0.0%)
• current_schemas: 0/1 (0.0%)
• to_array: 1/1 (100.0%)
• current_role: 0/2 (0.0%)
• first_value: 0/1 (0.0%)
• current_version: 1/1 (100.0%)
• current_role_type: 1/1 (100.0%)
• var_pop: 0/1 (0.0%)
• arrays_to_object: 3/3 (100.0%)
• array_cat: 1/1 (100.0%)
• count: 2/4 (50.0%)
• next_day: 1/1 (100.0%)
• stddev_pop: 0/1 (0.0%)
• timediff: 0/2 (0.0%)
• current_timestamp: 0/3 (0.0%)
• approx_percentile: 0/3 (0.0%)
• rank: 2/2 (100.0%)
• to_timestamp: 0/10 (0.0%)
• array_sort: 2/6 (33.3%)
• array_agg: 3/5 (60.0%)
• row_number: 0/1 (0.0%)

Overall: 84/237 (35.4%)