Make pip install command printed by 'logfire inspect' easy to copy

[alexmojaki]

Closes #126

For example, instead of printing:

To install these packages, run:

$ pip install opentelemetry-instrumentation-sqlite3 opentelemetry-instrumentation-jinja2
       opentelemetry-instrumentation-urllib opentelemetry-instrumentation-urllib3    

it now prints:

To install these packages, run:

pip install opentelemetry-instrumentation-urllib opentelemetry-instrumentation-sqlite3 opentelemetry-instrumentation-jinja2 opentelemetry-instrumentation-urllib3

i.e. the whole command is on one line, and there's no $. Now triple-clicking that line (at least in my terminals) selects the whole line for easy copy-pasting.

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