Support parsing `oneof` and `anyof` in params.schema

[imnisen]

Hi, I am trying to use (generate-client *some-symbol* "/path/to/execution-apis/openrpc.json") (where the api is from https://ethereum.github.io/execution-apis/api-documentation/) to generate a client, but failed because there is oneOf keyword in schema of method's params, such as:

{
			"name": "debug_getRawBlock",
			"summary": "Returns an RLP-encoded block.",
			"params": [
				{
					"name": "Block",
					"required": true,
					"schema": {
						"title": "Block number or tag",
						"oneOf": [
							{
								"title": "Block number",
								"type": "string",
								"pattern": "^0x(0|[1-9a-f][0-9a-f]*)$"
							},
							{
								"title": "Block tag",
								"type": "string",
								"enum": [
									"earliest",
									"finalized",
									"safe",
									"latest",
									"pending"
								],
								"description": "xxxxxxx"
							}
						]
					}
				}
			],
			"result": {
				"name": "Block RLP",
				"schema": {
					"title": "hex encoded bytes",
					"type": "string",
					"pattern": "^0x[0-9a-f]*$"
				}
			},
			"examples": [
				{
					"name": "debug_getRawBlock example",
					"params": [
						{
							"name": "Block",
							"value": "0x32026E"
						}
					],
					"result": {
						"name": "Block RLP",
						"value": "xxxxxxx"
					}
				}
			]
		},

I found it missing schema-to-type method in client/core.lisp, it defaults to get "type" of scheme:

openrpc/client/core.lisp

Line 131 in d951a3f

(let ((type (gethash "type" schema))

It would be nice to support paring it. Thanks!

[svetlyak40wt]

I can't work on this right now, but will be glad to review a pull-request.