[PBM-780] PBM SDK (incremental impl)

[defbin]

add deps:

go mod edit -require=github.com/percona/percona-backup-mongodb@${COMMIT_HASH}

import "github.com/percona/percona-backup-mongodb/sdk"

func getAllBackups(ctx context.Context, uri string) ([]sdk.BackupMetadata, error) {
	client, err := sdk.NewClient(ctx, uri)
	if err != nil {
		return nil, err
	}
	defer func() { _ = client.Close(context.TODO()) }()

	return client.GetAllBackups(ctx)
}