[Feature] Add command bru.rmVar(varType, key) and/or bru.rmEnvVar(key)

[bpoulaindev]

I have checked the following:

• [X] I've searched existing issues and found nothing related to my issue.

Describe the feature you want to add

Add a command bru.rmVar(varType, key) that would allow users to unset a variable (equivalent of pm.environment.unset but more modular) Javascript behavior (can be done in scripts tab) : replace "toDelete" with the key to delete, and "envVariables" by another varType

bru = Object.entries(bru).reduce((acc, [key, value]) => {
  acc[key] = key === "envVariables" ?
    Object.fromEntries(Object.entries(value).filter(([k]) => k !== "toDelete")) :
    value;
  return acc;
}, {});

Mockups or Images of the feature