Fix #720 ack(options) does not compile in TypeScript

[seratch]

Summary

This pull request resolves #720

Most developers (perhaps 100%) handle only block_suggestion requests in app.options listeners. Thus, this pull request set the default Source to block_suggestion to ensure better developer experience in TypeScript.

If a developer would like to handle either interactive_message (user actions on attachments) or dialog_suggestion (the ones in legacy dialogs), the developer can have an explicit type parameter as below:

app.options<'interactive_message'>({ callback_id: 'a' }, async ({ ack }) => {
  await ack();
});

app.options<'dialog_suggestion'>({ callback_id: 'a' }, async ({ ack }) => {
  await ack();
});

Requirements (place an x in each [ ])

• 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.

[codecov]

Codecov Report

Merging #878 (5054be8) into main (23b4f80) will not change coverage.
The diff coverage is n/a.

❗ Current head 5054be8 differs from pull request most recent head 3e98504. Consider uploading reports for the commit 3e98504 to get more accurate results

@@           Coverage Diff           @@
##             main     #878   +/-   ##
=======================================
  Coverage   66.08%   66.08%           
=======================================
  Files          13       13           
  Lines        1200     1200           
  Branches      353      353           
=======================================
  Hits          793      793           
  Misses        338      338           
  Partials       69       69           

Impacted Files	Coverage Δ
src/App.ts	82.76% <ø> (ø)

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[seratch]

This is the only change in the main code.

[mwbrooks]

Nice to see this land. I remembering running into this issue the first time I wanted to use ack with options.