Implemented the tooltip for table column headers

[nivzx]

The PR fulfills these requirements: (check all the apply)

• [x] It's submitted to the main branch.
• [x] When resolving a specific issue, it's referenced in the PR's title (e.g. feat: Add a button #xxx, where "xxx" is the issue number).
• [x] When resolving a specific issue, the PR description includes Closes #xxx, where "xxx" is the issue number.
• [ ] If changes were made to ui folder, unit tests (make test) still pass.
• [ ] New/updated tests are included

Closes #1792

Added a optional tooltip parameter to table_column

ui.table(name='table', columns=[
            ui.table_column(name='col1', label='Column 1', tooltip="I am a tooltip"),
            ui.table_column(name='col2', label='Column 2'),
        ]

The column header with tooltip property is displayed with a tooltip icon and the tooltip content is displayed when it's hovered.

cc @mturoci

[nivzx]

Fixed the styling issues. Will update the tests. Meanwhile please let me know your thoughts. cc: @mturoci

[x] The tooltip is too far away from the icon. [x] Hovering over icon shouldn't bring up pointer cursor since clicking the info icon triggers no action. [x] The table column styling should remain intact. [] Please add a unit tests to verify that the info button with tooltip is only rendered when tooltip prop is specified on a col. Columns without the prop should not render the info icon.