Rich log (#3046)

* log

* tests

* snapshot tests

* change to richlog

* keep raw lines

* disable highlighting by default

* simplify

* superfluous test

* optimization

* update cell length

* add refresh

* write method

* version bump

* doc fix link

* makes lines private

* docstring

* relax dev dependancy

* remove superfluous code [skip ci]

* added FAQ [skipci]

* fix code in faq [skipci]

* fix typo

* max lines fix

docs/examples/widgets/rich_log.py

@@ -0,0 +1,65 @@
+import csv
+import io
+
+from rich.syntax import Syntax
+from rich.table import Table
+
+from textual import events
+from textual.app import App, ComposeResult
+from textual.widgets import RichLog
+
+CSV = """lane,swimmer,country,time
+4,Joseph Schooling,Singapore,50.39
+2,Michael Phelps,United States,51.14
+5,Chad le Clos,South Africa,51.14
+6,László Cseh,Hungary,51.14
+3,Li Zhuhao,China,51.26
+8,Mehdy Metella,France,51.58
+7,Tom Shields,United States,51.73
+1,Aleksandr Sadovnikov,Russia,51.84"""
+
+
+CODE = '''\
+def loop_first_last(values: Iterable[T]) -> Iterable[tuple[bool, bool, T]]:
+    """Iterate and generate a tuple with a flag for first and last value."""
+    iter_values = iter(values)
+    try:
+        previous_value = next(iter_values)
+    except StopIteration:
+        return
+    first = True
+    for value in iter_values:
+        yield first, False, previous_value
+        first = False
+        previous_value = value
+    yield first, True, previous_value\
+'''
+
+
+class RichLogApp(App):
+    def compose(self) -> ComposeResult:
+        yield RichLog(highlight=True, markup=True)
+
+    def on_ready(self) -> None:
+        """Called  when the DOM is ready."""
+        text_log = self.query_one(RichLog)
+
+        text_log.write(Syntax(CODE, "python", indent_guides=True))
+
+        rows = iter(csv.reader(io.StringIO(CSV)))
+        table = Table(*next(rows))
+        for row in rows:
+            table.add_row(*row)
+
+        text_log.write(table)
+        text_log.write("[bold magenta]Write text or any Rich renderable!")
+
+    def on_key(self, event: events.Key) -> None:
+        """Write Key events to log."""
+        text_log = self.query_one(RichLog)
+        text_log.write(event)
+
+
+if __name__ == "__main__":
+    app = RichLogApp()
+    app.run()