Added EventListener to Resize the DiffEditor

[Priyansh61]

Proposed changes

This PR addresses Issue: zowe/zlux#851

This PR depends upon the following PRs: NA

resize-2023-06-16_19.00.23.mp4

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

PR Checklist

Please delete options that are not relevant.

• If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• My code follows the style guidelines of this project (see: Contributing guideline)
• I have commented my code, particularly in hard-to-understand areas
• video or image is included if visual changes are made
• Relevant update to CHANGELOG.md
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works, or describe a test method below

Testing

Further comments

[Priyansh61]

Closing this since a new PR present at #335