make the icon of header configurable

[python-and-fiction]

After I set ENABLE_COMMAND_PALETTE = False, I founded that the icon in header is still showing the tooltip about palette.
Maybe we can do something like the following code make the icon of header configurable.

from textual.widgets import Header
from textual.widgets._header import HeaderTitle, HeaderClock, HeaderClockSpace, HeaderIcon

class HeaderWithIcon(Header):
    def __init__(self, show_clock: bool = False, show_icon: bool = True, *, name: str | None = None, id: str | None = None, classes: str | None = None, icon: str | None = None, time_format: str | None = None):
        super().__init__(show_clock, name=name, id=id, classes=classes, icon=icon, time_format=time_format)
        self._show_icon = show_icon
        self.header_icon = HeaderIcon()
        self.header_icon.visible = self._show_icon    

    def compose(self):
        self.header_icon.data_bind(Header.icon)
        yield self.header_icon
        yield HeaderTitle()
        yield (
            HeaderClock().data_bind(Header.time_format)
            if self._show_clock
            else HeaderClockSpace()
        )
Header = HeaderWithIcon

By the hack way, I can change the visible and the tooltip of the icon:

h = Header()
h.header_icon.tooltip = 'No palette'

[github-actions]

We found the following entries in the FAQ which you may find helpful:

• Does Textual support images?
• How do I center a widget in a screen?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

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