Add syntax highlighting in the log viewer

[ruohanliu]

Request

To enhance the log viewing experience, some more coloring of text can be added.
Currently in dark mode:

1. timestamp and log level are colored in green.
2. digits are colored in blue

Requesting:

1. content in a string, enclosed by single/double/triple quotes to be colored in yellow
2. content in a python f-string enclosed by {} are colored in light blue
3. function/method signature is also colored. Depending on the implementation, potentially multiple colors can be used for different parts of the signature.

Please consider the color palette used in https://monokai.pro/

Possible implementation

n/a