add JSR support

[lambtron]

Summary

This PR includes the necessary import update to publish to JSR

Special notes

Let's discuss in Slack.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've ran deno task test after making the changes.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @lambtron @iuioiua to sign the Salesforce Inc. Contributor License Agreement.

[filmaj]

Changes look great to me, but we should look into why the integration of this PR into some of our sample apps yields typescript compilation problems 🤔

It might be how we re-mapped the deno-slack-api import in the sample project - perhaps w/ the imports now existing in deno.jsonc, the "update import map" script under scripts/ maybe needs to target deno.jsonc instead.

Also, a million thanks for sending the PR! <3 very gracious of you

Last thing: we cannot accept the PR without the Salesforce CLA being signed by commit authors. Otherwise company lawyers will be very mad at me 😧

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9105487) to head (869356b).
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           37        36    -1     
  Lines         1150      1130   -20     
  Branches        17        17           
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- Hits          1150      1130   -20     

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[crowlKats]

We have added a workaround fix for the issue.
The problem is the need of "composable importmaps", aka an importmap depending on a package that has its own importmap.
The workaround involves in copying the dependencies defined in the api importmap into the sample importmap. This can easily be fixed once things are published to JSR, as there is a dependency patching mechanism.

[filmaj]

Awesome! Everything passed! Going to merge shortly and we will aim to release these improvements this week sometime!