Store Values in Uppercase while updating settings

[myanzik]

All keys and values in the settings table should be stored in uppercase. However, when using the settings update API, the values are not being stored in uppercase as expected.

Example:
For the following setting:

{
  "BLOCKCHAIN": {
    "RPCURL": {URL: "http://rpc"},
    "CHAINNAME": "SEPOLIA",
    "NATIVECURRENCY": {
      "NAME": "eth",
      "SYMBOL": "eth"
    }
  }
}