feat: Clickhouse data source

[scsmithr]

Adds support for clickhouse as a data source.

read_clickhouse:

> select * from read_clickhouse('clickhouse://localhost:9000/default', 'bikeshare_stations') limit 1;
┌────────────┬──────────┬────────┬─────────┬───┬─────────────────┬───────┬──────────────────┬───────────────────┐
│ station_id │ name     │ status │ address │ … │ footprint_width │ notes │ council_district │ modified_date     │
│         ── │ ──       │ ──     │ ──      │   │              ── │ ──    │               ── │ ──                │
│      Int32 │ Utf8     │ Utf8   │ Utf8    │   │         Float32 │ Utf8  │            Int32 │ Timestamp<s, UTC> │
╞════════════╪══════════╪════════╪═════════╪═══╪═════════════════╪═══════╪══════════════════╪═══════════════════╡
│          0 │ South C… │ active │ 1901 S… │ … │            10.0 │ In t… │                9 │ 2022-03-04T09:01… │
└────────────┴──────────┴────────┴─────────┴───┴─────────────────┴───────┴──────────────────┴───────────────────┘

External database:

> create external database ch
::: from clickhouse
::: options ( connection_string = 'clickhouse://localhost:9000/default' );
Database created
> select status, address from ch.default.bikeshare_stations limit 1;
┌────────┬──────────────────────────┐
│ status │ address                  │
│ ──     │ ──                       │
│ Utf8   │ Utf8                     │
╞════════╪══════════════════════════╡
│ active │ 1901 South Congress Ave. │
└────────┴──────────────────────────┘

External table:

> create external table stations
::: from clickhouse
::: options ( connection_string = 'clickhouse://localhost:9000/default',
:::           table = 'bikeshare_stations' );
Table created
> select council_district, modified_date from stations limit 1;
┌──────────────────┬─────────────────────┐
│ council_district │ modified_date       │
│               ── │ ──                  │
│            Int32 │ Timestamp<s, UTC>   │
╞══════════════════╪═════════════════════╡
│                9 │ 2022-03-04T09:01:00 │
└──────────────────┴─────────────────────┘

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Follow up items: #2315