fix: 🐛 Added support for cancel record icon and cancel voice recording.

[apurva010]

Description

• Add support to cancel voice recording.
• Add field to set icon for cancel voice record.

Before:

https://github.com/SimformSolutionsPvtLtd/flutter_chatview/assets/122270609/49d7119a-a109-467c-a400-c558400d0ba3

After

https://github.com/SimformSolutionsPvtLtd/flutter_chatview/assets/122270609/d16ea17e-83a5-48a5-bc79-ed57c8f47ed0

Checklist

• [x] The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• [x] I have followed the Contributor Guide when preparing my PR.
• [ ] I have updated/added tests for ALL new/updated/fixed functionality.
• [x] I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• [x] I have updated/added relevant examples in examples or docs.

Breaking Change?

• [ ] Yes, this PR is a breaking change.
• [x] No, this PR is not a breaking change.

Related Issues

Closes #137