Fix with_session by migrating Session.new to keyword arguments (#219)

Summary:
I believe I have located a bug in the `FacebookAds#with_session` method in which it passes non-keyword arguments to `Session.new` on line 20. Bug being that `Session` instantiation only takes keyword arguments. If the method is in fact not broken, please do let me know, I could be overlooking something as I've just started working with this gem recently.

https://github.com/facebook/facebook-ruby-business-sdk/blob/ef8dc9b3be544eaf310564c750524eb4f48357d2/lib/facebook_ads.rb#L18-L23

https://github.com/facebook/facebook-ruby-business-sdk/blob/ef8dc9b3be544eaf310564c750524eb4f48357d2/lib/facebook_ads/session.rb#L12-L24

Here's a proof of concept of the current state versus the proposed changed state.

```ruby
# current broken with_session
irb(main):004* FacebookAds.with_session(access_token, app_secret) do
irb(main):005*   FacebookAds::AdAccount.get(ad_account_id, "name")
irb(main):006> end
/home/spin/.bundle/shop-server/ruby-3.3.7/gems/facebookbusiness-21.0.2/lib/facebook_ads/session.rb:16:in `initialize': wrong number of arguments (given 3, expected 0) (ArgumentError)
        from /home/spin/.bundle/shop-server/ruby-3.3.7/gems/facebookbusiness-21.0.2/lib/facebook_ads.rb:20:in `new'
        from /home/spin/.bundle/shop-server/ruby-3.3.7/gems/facebookbusiness-21.0.2/lib/facebook_ads.rb:20:in `with_session'

# example fixed with_session minimal local method, irb line 32
irb(main):031* def with_session(access_token, app_secret = nil, api_version = "v21")
irb(main):032*   FacebookAds::Session.current_session = FacebookAds::Session.new(access_token:, app_secret:, api_version:)
irb(main):033*   yield
irb(main):034> end
=> :with_session
irb(main):035* with_session(access_token, app_secret) do
irb(main):036*   FacebookAds::AdAccount.get(ad_account_id, "name")
irb(main):037> end
=> #<FacebookAds::AdAccount {:id=>"act_redacted"}>
irb(main):038>
```

Pull Request resolved: #219

Reviewed By: liliarizona

Differential Revision: D69335663

Pulled By: stcheng

fbshipit-source-id: 5b06a9799d0af65b1bb3f71e3e04a0f7fb202f4e

Author: larouxn

lib/facebook_ads.rb

@@ -15,9 +15,9 @@ module FacebookAds
   extend self
   extend Shortcuts
 
-  def with_session(access_token, secret = nil, api_version = DEFAULT_API_VERSION)
+  def with_session(access_token, app_secret = nil, api_version = DEFAULT_API_VERSION)
     original_session = Session.current_session
-    Session.current_session = Session.new(access_token, secret, api_version)
+    Session.current_session = Session.new(access_token: access_token, app_secret: app_secret, api_version: api_version)
     yield
     Session.current_session = original_session
   end