Proper Content-Type header on CCIP POST requests

[m1guelpf]

Currently, CCIP POST requests are sent without Content-Type headers, which makes requests fail for servers that reject the body if the header isn't present.

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PR-Codex overview

This PR focuses on enhancing the CCIP functionality by ensuring that POST requests include the appropriate Content-Type header, which is essential for correctly indicating the format of the data being sent.

Detailed summary

• In the ccip.ts file, a headers object is created for POST requests, setting Content-Type to application/json.
• The fetch call is updated to include the newly created headers object.

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Latest commit: ada370f

The changes in this PR will be included in the next version bump.

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