chore: 0.3.0 release

[AndyTWF]

Context

CHA-751

Description

This change:

• Updates the package version around the codebase
• Updates the CHANGELOG
• Updates the upcoming feature list in the README
• Adds UPGRADING.md to provide more guidance for upgrading
• Returns ably-js to tagged versions again, with the release of 2.6.0

Checklist

• QA'd by the author.
• Unit tests created (if applicable).
• Integration tests created (if applicable).
• Follow coding style guidelines found here.
• TypeDoc updated (if applicable).
• (Optional) Update documentation for new features.
• Browser tests created (if applicable).
• In repo demo app updated (if applicable).

Testing Instructions (Optional)

N/A

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[AndyTWF]

@owenpearson @splindsay-92 This is ready for a review. I need to bump the ably-js version in package.json, so will do that shortly before merging once ably-js has landed.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🟢	Lines	93.93% (🎯 92%)	3316 / 3530
🟢	Statements	93.93% (🎯 92%)	3316 / 3530
🟢	Functions	96.15% (🎯 92%)	250 / 260
🟢	Branches	94.45% (🎯 93%)	852 / 902

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/core/chat-api.ts	100%	90.9%	100%	100%
src/core/headers.ts	0%	0%	0%	0%	1
src/core/id.ts	100%	100%	100%	100%
src/core/message.ts	100%	100%	100%	100%
src/core/messages.ts	92.85%	92.15%	100%	92.85%	426-428, 458-462, 474-478, 593-595, 628-630
src/core/metadata.ts	0%	0%	0%	0%	1
src/core/version.ts	100%	100%	100%	100%
src/react/helper/room-promise.ts	97.72%	100%	100%	97.72%	66
src/react/hooks/use-messages.ts	96.11%	92.59%	100%	96.11%	145-146, 153-154

Generated in workflow #1878 for commit 26fa7a9 by the Vitest Coverage Report Action