Add auto-update changelog files from changelog/** branches action

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Commits
Files that changed from the base of the PR and between 9692710617a293499d7109c013a891b332303fab and 3e957df92dad05bdaac001c7f4cc7f743ae14a04.

Walkthrough

Automates the process of updating the changelog in the repository. Introduces a GitHub Actions workflow (update-changelog.yml) to manage changelog updates triggered by pull request events. It utilizes a changelog/bin/update.js script to aggregate and format changelog entries from various MDX files into a single document, ensuring each entry is properly categorized and timestamped.

Changes

Files	Change Summaries
`.github/workflows/update-changelog.yml`	Adds GitHub Actions workflow to automate changelog updates based on PR events.
`changelog/bin/update.js`	Introduces a script that combines MDX files, adding headers and categorizing changes.
`changelog/src/libraries/06122024.mdx`	Describes enhancements in `flatfile` version `3.7.0` related to file upload handling and event topics.
`changelog/src/platform/06062024.mdx`	Adds `Resend User Invite` endpoint functionality on June 6, 2024.
`changelog/src/platform/06072024.mdx`	Details new features: Select Header Row and Search for Users, introduced on June 7, 2024.
`changelog/src/plugins/0412.2024.mdx`	Introduces `@flatfile/plugin-graphql-schema@1.0.0` with GraphQL to Flatfile Blueprint functionality.
`changelog/src/test/06272024.mdx`	Adds a placeholder entry for `flatfile/changelog` on June 27, 2024.

Sequence Diagrams

sequenceDiagram
    participant Dev as Developer
    participant GitHub as GitHub
    participant Action as update-changelog.yml
    participant Script as update.js

    Dev->>GitHub: Create/Modify Pull Request
    GitHub->>Action: Trigger Workflow
    Action->>Script: Check for changelog/src changes
    Script->>Script: Install dependencies and run changelog script
    Script->>GitHub: Commit updated changelog
    GitHub->>Dev: Notify of changelog update

Possibly related issues

FlatFilers/Guides#1160
- The changes in this PR directly address the first part of the issue by updating and automating the changelog process.

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FlatFilers / Guides