feat: Add DatabaseOptions to let callers specify the metadata file path

[and-cb]

Also add a way to create a new database, without failing if it already exists.

Examples

// Open or create
Database::options().create(true).open(".../path");

// Create or fail if the db already exists
Database::options().create_new(true).open(".../path");

// Create or wipe if the db already exists
Database::options().create(true).wipe(true).open(".../path");

// Specify a path for the metadata file
Database::options().meta_path(".../meta-path").open(".../db-path");

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

Approved review 2962786088 from BrianBland is now dismissed due to new commit. Re-request for approval.