320: add version to _dlt_loads table

[codingcyclist]

Resolves 320

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[rudolfix]

code changes are solid and all is ok there! thanks!
we still need to improve some tests. I enabled CI for your fork and a few tests are not passing

1. small linter issue (if you have poetry and make you can just do make dev && make lint)
2. common test problems: https://github.com/dlt-hub/dlt/actions/runs/5430315589/jobs/9969881019?pr=466

why the common tests are failing: each schema has a content hash used to detect schema changes. increasing the version changed the hash (when I load fixtures in tests, your migration modifies the content and we get a different hash - then tests that check hashes fail)
to fix: we need a v6 version of this fixture: ethereum_schema_v5.yml. I generate it with a dlt command:

dlt schema tests/common/cases/schemas/eth/ethereum_schema_v5.yml --remove-defaults

and save the output to new name. from it you can get the new content hash and put it into IMPORTED_VERSION_HASH_ETH_V5 constant (used by the tests)

btw. we'll upgrade our CI to be more friendly for PRs from forks: #476

if the above looks too complicated or unclear just ping us, someone will take over the final fixes

[codingcyclist]

Hi @rudolfix Thanks a lot for your comments :) I took a stab at them and things look good locally. However, the nefly CI seems to be blocking the test from running on my fork. Is there anything I can do about that 🤔 ?

[rudolfix]

@codingcyclist I just unblocked CI. again... maybe it blocks PRs after some inactivity. will check out

[rudolfix]

LGTM!