Remove electrum limit, sort by url

[smk762]

Prior to this PR, coins with more than 3 electrums would have this sliced down to just 3 active. In light of GLEECBTC/komodo-defi-framework#1966 this limit is better handled in the kdf/app layer.

Additionally, the nodes, rpc_urls and electrums values for coins in the coins_config.json output are sorted alphabetically (by the url key) - this will help avoid "diff inflation" from new PRs where only the sequence of spv server objects has changed.

[mariocynicys]

bear in mind though that GUIs would need to include max_connected: 3 in the electrum enable request to achieve the same setup removed here. max_connected is assumed infinity by default.

[cipig]

Problem is this from utils/coins_config_tcp.json

        "electrum": [
            {   
                "url": "electrum1.cipig.net:10001",
                "contact": [
                    {
                        "email": "cipi@komodoplatform.com"
                    },
                    {
                        "discord": "cipi#4502"
                    }
                ],
                "protocol": "TCP"
            },
            {
                "url": "electrum1.cipig.net:20001",
                "protocol": "SSL",
                "contact": [
                    {
                        "email": "cipi@komodoplatform.com"
                    },
                    {
                        "discord": "cipi#4502"
                    }
                ]
            },
            {
                "url": "electrum1.cipig.net:30001",
                "protocol": "WSS",
                "contact": [
                    {
                        "email": "cipi@komodoplatform.com"
                    },
                    {
                        "discord": "cipi#4502"
                    }
                ]
            },
            {
                "url": "electrum2.cipig.net:10001",
                "contact": [
                    {
                        "email": "cipi@komodoplatform.com"
                    },
                    {
                        "discord": "cipi#4502"
                    }
                ],
                "protocol": "TCP"
            },

so mm2 will connect to electrum1 twice, with TCP and with SSL
can we make it so that one electrum server (like electrum1.cipig.net) is present only once?