feat: enable gateway-conformance tests

[SgtPooki]

similar to https://github.com/ipfs/bifrost-gateway/blob/70f10e7b9688cd504f881d57ff3fa71215813e16/.github/workflows/gateway-conformance.yml

Currently passing tests on #57 (last updated 2023-12-04):

`subdomain-ipns-gateway`

PASS: TestMetadata (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28direct_HTTP%29/Status_code (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28HTTP_proxy%29/Status_code (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28direct_HTTP%29#01/Status_code (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28HTTP_proxy%29#01/Status_code (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28direct_HTTP%29#02/Status_code (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28HTTP_proxy%29#02/Status_code (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28direct_HTTP%29#03/Status_code (0.00s)
PASS: TestGatewaySubdomainAndIPNS/request_for_%7BCIDv1-libp2p-key%7D.ipns.%7Bgateway%7D_returns_expected_payload_%28HTTP_proxy%29#03/Status_code (0.00s)

`subdomain-ipfs-gateway`

PASS: TestMetadata (0.00s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28direct_HTTP%29/Status_code (0.00s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28direct_HTTP%29/Body (0.00s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28direct_HTTP%29 (0.99s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28HTTP_proxy%29/Status_code (0.00s)
PASS: TestGatewaySubdomains/valid_file_and_subdirectory_paths_in_directory_listing_at_%7Bcid%7D.ipfs.example.com_%28direct_HTTP%29/Status_code (0.00s)
PASS: TestGatewaySubdomains/valid_file_and_subdirectory_paths_in_directory_listing_at_%7Bcid%7D.ipfs.example.com_%28HTTP_proxy%29/Status_code (0.00s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28direct_HTTP%29#01/Status_code (0.00s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28direct_HTTP%29#01/Body (0.00s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28direct_HTTP%29#01 (0.00s)
PASS: TestGatewaySubdomains/request_for_%7BCID%7D.ipfs.example.com_should_return_expected_payload_%28HTTP_proxy%29#01/Status_code (0.00s)
PASS: TestGatewaySubdomains/valid_file_and_subdirectory_paths_in_directory_listing_at_%7Bcid%7D.ipfs.example.com_%28direct_HTTP%29#01/Status_code (0.00s)
PASS: TestGatewaySubdomains/valid_file_and_subdirectory_paths_in_directory_listing_at_%7Bcid%7D.ipfs.example.com_%28HTTP_proxy%29#01/Status_code (0.00s)

### Tasks
- [x] Figure out how to load fixtures (need to do via new api-endpoint if we're using in-memory block/data stores)
- [ ] Address failure for `http://localhost:8090/ipns/?uri=ipns%3A%2F%2Fdnslink-subdomain-gw-test.example.org` requests
- [ ] fix `http://localhost:8090/ipns/dnslink-subdomain-gw-test.example.org/wiki`
- [ ] fix `http://k51qzi5uqu5dk3v4rmjber23h16xnr23bsggmqqil9z2gduiis5se8dht36dam.ipns.localhost:8090
- [ ] fix `http://localhost:8090/ipns/QmVujd5Vb7moysJj8itnGufN7MEtPRCNHkKpNuA4onsRa3`
- [ ] fix IPNS resolution using IPNS fixtures loaded in kubo

[lidel]

There is more recent prior art in ipfs/rainbow#34 where rainbow gateway is peered to a kubo node and the fixtures are loaded into kubo. then rainbow is able to find them thanks to being connected to kubo. Something similar could be done in this repo.

[SgtPooki]

There is more recent prior art in ipfs/rainbow#34 where rainbow gateway is peered to a kubo node and the fixtures are loaded into kubo. then rainbow is able to find them thanks to being connected to kubo. Something similar could be done in this repo.

That's a great idea, thanks