Support logging in to multiple APIML instances per config file

[t1m0thyj]

Currently we only support logging in to the APIML for base profiles, and there can only be one active base profile per team config file. If nested profiles like the example below are defined, users may want to log in to multiple APIML instances per team config file. Either Zowe CLI should also support this scenario with zowe auth login, or we should document it as a known limitation.

{
    "$schema": "./zowe.schema.json",
    "profiles": {
        "lpar1": {
            "profiles": {
                "zosmf": {
                    "type": "zosmf",
                    "properties": {
                        "basePath": "/ibmzosmf/api/v1"
                    }
                }
            },
            "properties": {
                "host": "example1.com",
                "port": 7554,
                "rejectUnauthorized": true,
                "tokenType": "apimlAuthenticationToken"
            },
            "secure": [
                "tokenValue"
            ]
        },
        "lpar2": {
            "profiles": {
                "zosmf": {
                    "type": "zosmf",
                    "properties": {
                        "basePath": "/ibmzosmf/api/v1"
                    }
                }
            },
            "properties": {
                "host": "example2.com",
                "port": 7554,
                "rejectUnauthorized": true,
                "tokenType": "apimlAuthenticationToken"
            },
            "secure": [
                "tokenValue"
            ]
        }
    },
    "defaults": {
        "zosmf": "lpar1.zosmf"
    },
    "autoStore": true
}

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[t1m0thyj]

Zowe CLI may already support this when the --base-profile option is specified on the auth login command. We should confirm this and document the process if it works.