Query method implementations

[psy2848048]

• Implemented query methods
• Please review the commit 387167f .
  • Whole XrplClient.swift
  • BaseMethod.swift -> Protocol and its BaseRequest
  • Tests

[jaeminDelightlabs]

Rather than unwrapping, it might be better to maintain type safety and handle values explicitly using optional binding.

Suggested change

	do {
	let res: R = try await http.request(
	httpMethod: http.HttpMethod.post,
	url: URL.init(string: self.host)!,
	params: data
	)!
	return res
	} catch let err {
	throw err
	}
	guard let url = URL.init(string: self.host) else {
	throw http.APIError.invalidURL
	}
	do {
	guard let res: R = try await http.request(
	httpMethod: http.HttpMethod.post,
	url: url,
	params: data
	) else{
	// Unexpected data format
	throw http.APIError.cannotParseRequest
	}
	return res;
	} catch let err {
	throw err
	}

[psy2848048]

Thx to the commit 2a30e8a, the snippet is simplified as c931798