Implement pre-publish checks using Message/PresenceMessage/Annotation size

[sacOO7]

• We introduced both server side and client side message size checking to avoid sending big messages.
• Related spec PR => Message/PresenceMessage/Annotation size specification#331
• Once PR is approved and merged, need to add size method to each of those message types and throw exception if size exceeds maxMessageSize#TO3l8 before publishing the message.

┆Issue is synchronized with this Jira Task by Unito

[sacOO7]

Related spec points

1. RestChannel Publish -> https://sdk.ably.com/builds/ably/specification/main/features/#RSL1i
2. RestAnnotation Publish -> https://sdk.ably.com/builds/ably/specification/main/features/#RSAN1a4