[Enh request] Filter

[ToontjeM]

Please add a filter that lets you enter a string and only lines with (or without) that string are shown.

[JohnAmadeo]

@willmcgugan off the top of your head, do you know if this would be a fairly simple addition?

e.g Would be sufficient to add an else-block at this code pointer & not call text.render at this code pointer: https://github.com/Textualize/toolong/blob/e564702784cfa85071e73947ebf9aaaf2d535d7a/src/toolong/log_lines.py#L634-L636

I might be interested in taking a crack at adding this if it's a small-ish change

[ser]

it would be extremaly useful indeed!