check for selector

[sgarciaanato]

What does this PR do?

Evaluate if payload responds to selectorseg_gzippedData before being called

Where should the reviewer start?

SEGHTTPClient.m L:106

How should this be manually tested?

No

Any background context you want to provide?

integrating analytics-ios with swift package manager doesn't access this selector, having this evaluation is a safe way of avoiding crashes

What are the relevant tickets?

Screenshots or screencasts (if UI/UX change)

Questions:

• Does the docs need an update? No
• Are there any security concerns? No
• Do we need to update engineering / success? No