added http config api to PluginManager for synchronous connection config updates

[Abhi011999]

API reference

POST /v1/connection/config

Request body:

{
  "connection": "aws_tenant_123",
  "plugin": "hub.steampipe.io/plugins/turbot/aws@latest",
  "plugin_short_name": "aws",
  "config": "regions = [\"us-east-1\"]\naccess_key = \"...\"\nsecret_key = \"...\"\nsession_token = \"...\"",
  "plugin_instance": "aws"
}

Notes:

• config is plugin attributes only (no outer connection {} block).
• handler resolves/normalizes plugin fields against existing connection metadata where available.

Success response:

{"success": true}

Error response:

{"success": false, "error": "..."}

Status codes:

• 200: config updated (and schema created for new connection)
• 400: invalid JSON / missing required field
• 405: non-POST method
• 500: update or schema-creation failure

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