Add generic support for LTS rules

[maxim-lobanov]

Context

We need to add new additional property for Node.js versions-manifest.json to show lts title based on https://raw.githubusercontent.com/nodejs/Release/main/schedule.json

We shouldn't implement any node-specific logic on manifest-generator level because we need to keep it generic.
I have decided to add support for custom expressions on config level.

How it works

Manifest generator imports lts_rule_expression from config, run it and use expression result as a source of rules for LTS decision

Drawbacks

It is not super convenient to keep PowerShell expression as a JSON property but it will allow us to stay generic.

How Node.js config will look like

{
    "regex": "node-\\d+\\.\\d+\\.\\d+-(\\w+)-(x\\d+)",
    "groups": {
        "arch": 2,
        "platform": 1
    },
    "lts_rule_expression": "(Invoke-RestMethod 'https://raw.githubusercontent.com/nodejs/Release/main/schedule.json').PSObject.Properties | Where-Object { $_.Value.codename } | ForEach-Object { @{ Name = $_.Name.TrimStart('v'); Value = $_.Value.codename } }"
}