feat: export database instances

[sandros94]

Resolves #131

A non-breaking change that adds getInstance (following the naming convention from unstorage) to access a fully typed database client used internally.

Notes

• wasn't able to test mysql and planetscale

[sandros94]

while debugging why the mysql test is failing it was pointed out on discord that it is missing from the connector's meta

db0/src/index.ts

Lines 17 to 29 in 41ff740

	export const connectors = {
	sqlite: "db0/connectors/better-sqlite3",
	postgresql: "db0/connectors/postgresql",
	pglite: "db0/connectors/pglite",
	"cloudflare-d1": "db0/connectors/cloudflare-d1",
	libsql: "db0/connectors/libsql/node",
	"libsql-node": "db0/connectors/libsql/node",
	"libsql-http": "db0/connectors/libsql/http",
	"libsql-web": "db0/connectors/libsql/web",
	bun: "db0/connectors/bun-sqlite",
	"bun-sqlite": "db0/connectors/bun-sqlite",
	planetscale: "db0/connectors/planetscale",
	} as const;

This at least explains the ts error

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@db54a4c). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/connectors/bun-sqlite.ts	0.00%	2 Missing ⚠️
src/connectors/cloudflare-d1.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #132   +/-   ##
=======================================
  Coverage        ?   46.24%           
=======================================
  Files           ?       19           
  Lines           ?      679           
  Branches        ?       66           
=======================================
  Hits            ?      314           
  Misses          ?      360           
  Partials        ?        5           

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[ahocevar]

Is there anything I can do to help finish this? Do we need to make Codecov happy? Are tests for mysql and planetscale needed?