build: ignore autogenerated files created by eclipse.jdt.ls

[zimeg]

This PR adds .factorypath - a file automatically created by eclipse.jdt.ls - to the project .gitignore file. The bin/ from the bolt-spring-boot-examples/spring-boot-2 project is also being generated and ignored too, but I'm not sure why only this bin/ is being generated 🤔

Category

• [ ] bolt (Bolt for Java)
• [ ] bolt-{sub modules} (Bolt for Java - optional modules)
• [ ] slack-api-client (Slack API Clients)
• [ ] slack-api-model (Slack API Data Models)
• [ ] *slack-api--kotlin-extension** (Kotlin Extensions for Slack API Clients)
• [ ] slack-app-backend (The primitive layer of Bolt for Java)
• [x] Other

Requirements

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.34%. Comparing base (8183ad5) to head (2df7e74).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1284 +/- ## ============================================ - Coverage 74.36% 74.34% -0.03% + Complexity 4131 4129 -2 ============================================ Files 444 444 Lines 13114 13114 Branches 1325 1325 ============================================ - Hits 9752 9749 -3 - Misses 2588 2590 +2 - Partials 774 775 +1 ```

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