More verbose console logging fixes

[alexmojaki]

Example script:

import datetime
import decimal

import logfire

logfire.configure(console=logfire.ConsoleOptions(verbose=True))

logfire.info('hi', d=datetime.datetime.now(), v=decimal.Decimal('1.0'))
logfire.info('hi', x=None)

With this PR:

11:04:25.386 hi
             │ scratch_1502.py:9 info
             │ d=2025-05-14T13:04:25.366639
             │ v=1.0
11:04:25.386 hi
             │ scratch_1502.py:10 info
             │ x=None

Before:

11:04:58.030 hi
             │ scratch_1502.py:8 info
             │ d=[
             │       '2',
             │       '0',
             │       '2',
             │       '5',
             │       '-',
             │       '0',
             │       '5',
             │       '-',
             │       '1',
             │       '4',
             │       'T',
             │       '1',
             │       '3',
             │       ':',
             │       '0',
             │       '4',
             │       ':',
             │       '5',
             │       '8',
             │       '.',
             │       '0',
             │       '1',
             │       '0',
             │       '7',
             │       '1',
             │       '4',
             │   ]
             │ v=[
             │       '1',
             │       '.',
             │       '0',
             │   ]
11:04:58.030 hi
             │ scratch_1502.py:9 info
Exception while exporting Span.
Traceback (most recent call last):
  File "/Users/alex/work/logfire/.venv/lib/python3.12/site-packages/opentelemetry/sdk/trace/export/__init__.py", line 114, in on_end
    self.span_exporter.export((span,))
  File "/Users/alex/work/logfire/logfire/_internal/exporters/console.py", line 148, in export
    self.export_record(Record.from_span(span))
  File "/Users/alex/work/logfire/logfire/_internal/exporters/console.py", line 417, in export_record
    self._print_span(span)
  File "/Users/alex/work/logfire/logfire/_internal/exporters/console.py", line 181, in _print_span
    self._print_arguments(span, indent_str)
  File "/Users/alex/work/logfire/logfire/_internal/exporters/console.py", line 268, in _print_arguments
    value = json_args_value_formatter(value, schema=schema)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/alex/work/logfire/logfire/_internal/json_formatter.py", line 61, in __call__
    self._format(indent_current, True, value, schema)
  File "/Users/alex/work/logfire/logfire/_internal/json_formatter.py", line 73, in _format
    self._format_list_like('[', ']', indent_current, value, schema)
  File "/Users/alex/work/logfire/logfire/_internal/json_formatter.py", line 132, in _format_list_like
    for i, v in enumerate(value):
                ^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not iterable