Add initial devcontainer configuration

[samiepaige91]

Description

PLEASE NOTE- Checklist must be complete prior to review.

Checklist

• Increment the version field in package.json of the package you have made changes in following semantic versioning and using alpha release tagging
• Check the box that allows repo maintainers to update this PR
• Test locally to make sure this feature/fix works
• Run yarn check-all to confirm there are not any associated errors
• Confirm this PR passes Circle CI checks
• Add or update relevant information in the documentation

Docs Checklist

• Include a screenshot of any changes (see docs README on running locally)
• Add/update the appropriate package README (if applicable)
• Add/update the related module in the docs demo (if applicable)
• Add/update the related package in the docs/package.json file (if applicable)

If this PR includes changes to add an injected wallet or SDK wallet module:

Please complete the following using the internal demo package.
To run this demo use the command yarn && yarn dev to get the project running at http://localhost:8080/

Tests with demo app (injected)

• send transaction
• switch chains
• sign message
• sign typed message
• disconnect

Tests with demo app (SDK)

• send transaction
• switch chains
• sign message
• sign typed message
• disconnect

Summary by CodeRabbit

• Chores
  • Added development container configuration to streamline local development environment setup.

[coderabbitai]

Walkthrough

This change adds a Dev Container configuration file at .devcontainer/devcontainer.json that specifies a base development environment image with no additional features enabled.

Changes

Cohort / File(s)	Summary
Dev Container Configuration .devcontainer/devcontainer.json	Adds Dev Container configuration specifying mcr.microsoft.com/devcontainers/universal:2 as the base image with an empty features object.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description lacks the required 'Description' section explaining what the devcontainer configuration does and why it's being added.	Add a detailed description explaining the purpose of the devcontainer configuration, what it sets up, and the benefits it provides to developers.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change - adding a devcontainer configuration file, which is the sole purpose of this PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

📝 Coding Plan

• Generate coding plan for human review comments

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[samiepaige91]

Explicit approval