Api cleanup

[adamgall]

This PR was created in response to the TODO in SignedMessageForm, in the middle of the button click which triggers an API call.

rescue-ui/src/components/SignedMessageForm.tsx

Lines 117 to 142 in 98a6fa9

	(async () => {
	setIsCreating(true);
	setError("");
	try {
	const res = await Api.createCredentials({
	body: value,
	query: {
	operator_type: operatorType,
	},
	});
	// TODO: consider folding the .error/.data handling into the `Api` client.
	if (res.error) {
	setError(res.error as string);
	}
	if (!res.data) {
	console.log("missing .data and .error", res);
	setError("invalid response (missing .data and .error)");
	}
	onCredentialCreated(res.data as AccessCredential);
	} catch (err) {
	console.log("error", err);
	setError(err ? (err as string) : "Unknown error");
	} finally {
	setIsCreating(false);
	}
	})().catch(() => {});

I took the liberty of just generally "cleaning up" the Api object, to enforce more proper typing for requests and responses (no more anys), as well as consolidate all data parsing and error handling into the shared internal rpc function.

Other auxiliary changes in this PR include:

• Adding typing to the environment variables
• Including a vite plugin which informs the dev of any typescript issues in the project, in the npm run dev console.
• Removing unused and derive-able props from the SignedMessageForm component