feat: add solvelimit to config.yaml, matching timeout value

[cstenico]

This PR introduces the ability to set the solvelimit parameter in config.yaml for VROOM-Express. The proposed value matches the default VROOM timeout, allowing the time limit to be configured globally instead of being specified in each request.

Changes:

• Added solvelimit parameter to config.yaml.
• The value of solvelimit is set to match the default VROOM timeout.

Benefits:

• Streamlines configuration by enabling users to set the time limit once in config.yaml.
• Eliminates the need to include the time limit option in each request to VROOM.
• Ensures consistent behavior with VROOM's default timeout settings.

[jcoupey]

Thanks for the PR, I can definitely see that this may be useful. Only concern here is that there is actually no default value for -l when using vroom on the command-line, so we'd go from no limit down to 300 seconds by default.

[jcoupey]

Will change behavior as the default for -l on the command-line is no limit.