docs: Upgraded fee-abstraction to stable

[Eengineer1]

This pull request includes updates to the docs/cheqd-cli/cheqd-cli-fee-abstraction.md file to enhance clarity on the fee abstraction process and update IBC denomination references. The most important changes include clarifications on bridging tokens from Osmosis to cheqd, updating IBC denomination references, and adding detailed steps for interacting with fee abstraction.

Clarifications and updates:

• Updated instructions to clarify the process of bridging tokens from Osmosis to cheqd and checking balances.
• Changed IBC denomination references throughout the document to reflect the correct denominations for cheqd and Osmosis chains. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Detailed steps for interacting with fee abstraction:

• Added detailed steps for sending tokens over IBC, checking balances, and declaring fees for transactions using both --gas and --fees flags. [1] [2] [3] [4]