Support events outside of contracts

[Maltby]

What was wrong?

Events can only be defined within contracts.
closes #80

How was it fixed?

Handle module level events in analyzer and lowering crates.

To-Do

• OPTIONAL: Update Spec if applicable
• Add entry to the release notes (may forgo for trivial changes)
• Clean up commit history

[codecov-commenter]

Codecov Report

Merging #654 (23d59a4) into master (897f159) will increase coverage by 0.06%.
The diff coverage is 90.32%.

❗ Current head 23d59a4 differs from pull request most recent head b65e3a4. Consider uploading reports for the commit b65e3a4 to get more accurate results

@@            Coverage Diff             @@
##           master     #654      +/-   ##
==========================================
+ Coverage   85.81%   85.88%   +0.06%     
==========================================
  Files          97       98       +1     
  Lines        9075     9081       +6     
==========================================
+ Hits         7788     7799      +11     
+ Misses       1287     1282       -5     

Impacted Files	Coverage Δ
crates/analyzer/src/namespace/items.rs	83.61% <25.00%> (+0.36%)	⬆️
crates/analyzer/src/db/queries/contracts.rs	92.38% <100.00%> (+0.03%)	⬆️
crates/analyzer/src/db/queries/module.rs	79.89% <100.00%> (+0.86%)	⬆️
crates/lowering/src/mappers/contracts.rs	100.00% <100.00%> (ø)
crates/lowering/src/mappers/events.rs	100.00% <100.00%> (ø)
crates/lowering/src/mappers/module.rs	84.33% <100.00%> (+1.20%)	⬆️
crates/parser/src/ast.rs	89.24% <0.00%> (+0.29%)	⬆️

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[Y-Nak]

Thanks, @Maltby! And sorry for the late reply that causes some conflicts.
LGTM! I'll merge this PR when conflicts are resolved.

nit;

• Could you add closes #{issue_number} to the PR comment in order to make the corresponding issue close automatically when the PR is merged?
• Could you add 80.features.md in newsfragments? We use them for release notes.

[sbillig]

Sorry @Maltby, I should have merged this before I greedily merged my own changes that touch all sorts of analyzer code.

[Maltby]

Thanks @Y-Nak ! I added closes #80 to the comment and created 80.features.md.

@sbillig No worries, I got it merged without much hassle :)

[Y-Nak]

Thanks, @Maltby! Beautiful work!