feat: Fixes issue #413: Set max width of event slot in week & day view

[shubham-jitiya-simform]

Description

Use maxWidth to define the maximum width of event slot. If enough space is available, the event slot will use the specified max width. Otherwise, it will reduce to fit all events in the cell. If max width is not specified, slots will expand to fill the cell.

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 #413