Check robustness to missing fields: servers should reject and otherwise ignore
bad requests.

Fixed bugs:
- No id in 'initialize' should not panic (#197).
- No id in 'ping' should not panic (#194).
- No params in 'initialize' should not panic (#195).
- Notifications with IDs should not be treated like requests. (#196)
- No params in 'logging/setLevel' should not panic.
- No params in 'completion/complete' should not panic.
- JSON null params should also not panic in these cases.

-- prompts --
code_review

-- client --
{
  "jsonrpc": "2.0",
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {},
    "clientInfo": { "name": "ExampleClient", "version": "1.0.0" }
  }
}
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "initialize"
}
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {},
    "clientInfo": { "name": "ExampleClient", "version": "1.0.0" }
  }
}
{ "jsonrpc":"2.0", "id": 3, "method": "notifications/initialized" }
{ "jsonrpc":"2.0", "method": "notifications/initialized" }
{ "jsonrpc":"2.0", "method":"ping" }
{ "jsonrpc":"2.0", "id": 4, "method": "logging/setLevel" }
{ "jsonrpc":"2.0", "id": 5, "method": "completion/complete" }
{ "jsonrpc":"2.0", "id": 4, "method": "logging/setLevel", "params": null }

-- server --
{
	"jsonrpc": "2.0",
	"id": 1,
	"error": {
		"code": -32600,
		"message": "invalid request: missing required \"params\""
	}
}
{
	"jsonrpc": "2.0",
	"id": 2,
	"result": {
		"capabilities": {
			"logging": {},
			"prompts": {
				"listChanged": true
			}
		},
		"protocolVersion": "2024-11-05",
		"serverInfo": {
			"name": "testServer",
			"version": "v1.0.0"
		}
	}
}
{
	"jsonrpc": "2.0",
	"id": 3,
	"error": {
		"code": -32600,
		"message": "invalid request: unexpected id for \"notifications/initialized\""
	}
}
{
	"jsonrpc": "2.0",
	"id": 4,
	"error": {
		"code": -32600,
		"message": "invalid request: missing required \"params\""
	}
}
{
	"jsonrpc": "2.0",
	"id": 5,
	"error": {
		"code": -32600,
		"message": "invalid request: missing required \"params\""
	}
}
{
	"jsonrpc": "2.0",
	"id": 4,
	"error": {
		"code": -32600,
		"message": "handling 'logging/setLevel': invalid request: missing required \"params\""
	}
}