Release/0.8.0

[colmsnowplow]

This PR:

• Updates to v1.3.0 of our kinsumer fork, which resolves various stability issues
• Fixes lint issues missed in previous release by renaming source methods to be more brief
• Adds lint checks to both CI and CD, failing the build unless lint passes
• Makes Several source related functions and objects private, which don't need to be exported. Now the only exported source methods should be those used in another package.

[colmsnowplow]

I am only slightly concerned about rebasing release/1.0.0 onto master after merging this PR because of the merge conflicts and the edits needed afterwards.

Yeah I did think about this - but ultimately almost everything affected needs to be renamed to fix the linter, so regardless a rebase is needed.

I plan on looking after the 1.0.0 branch rebase - I've already got a WIP branch, which I just published now just in case you want to see: https://github.com/snowplow-devops/stream-replicator/tree/test-rebase-branch

The plan for this will be:

• I will publish this release
• I will rebase the 1.0.0 similarly to how things are in that branch I just linked
• I will open a PR into the 1.0.0 branch and request a review, so that yourself and Robert can double-check everything is in order (obviously this PR won't be mergeable)
• I will then force push the rebased branch onto 1.0.0 (or rename the branches, doesn't matter which).

From then on, only new work that's not yet on the 1.0.0 branch will need to be concerned with a rebase - and I don't think any of that work will conflict with what's in here, so it should just be a simple rebase.