chore: Changelog and Release Notes for 0.43.0-rc3

[amaury1093]

Description

Releasing RC3 today.

depends on :

• chore: added changelog for 9793 (secp256r1 tx malleability) (backport #9796) #9798
• Impossible to create IBC channels after on-chain upgrade #9800
• fix: fixed missing coin denomination in msg server logs #9786

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[orijbot]

Visit https://dashboard.github.orijtech.com?pr=9801&repo=cosmos%2Fcosmos-sdk to see benchmark details.

[robert-zaremba]

We need to include:

• fix: fixed missing coin denomination in msg server logs #9786
• Impossible to create IBC channels after on-chain upgrade #9800

[robert-zaremba]

Pre approving. Let's:

• extend the x/capability description
• add a note about <app> tx distribution withdraw-all-rewards update