docs(upgrade): add changelog entry for v2.0.0

[troian]

Description

Closes: #XXXX

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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
• 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

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 9df8eb2 and aec1a3b.

📒 Files selected for processing (1)

• upgrades/CHANGELOG.md

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Walkthrough

A changelog entry for v2.0.0 was added, documenting the introduction of five new stores (epochs, oracle, awasm, wasm, bme), removal of the take store, and a deployment migration from version 6 to 7.

Changes

Cohort / File(s)	Summary
Changelog Entry upgrades/CHANGELOG.md	Added v2.0.0 release notes documenting new store additions (epochs, oracle, awasm, wasm, bme), store deletion (take), and deployment version migration (6 → 7).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Five new stores hop into view,
While take makes its adieu,
Version six to seven we climb,
A changelog for a brighter time! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch upgrade-changelog

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