fix: move peerdeps, add files field, expand keywords

[tobiadewola41-eng]

closes #210

• Move sorokit-core and @creit.tech/stellar-wallets-kit from dependencies to peerDependencies (>=0.1.0 / >=1.0.0 ranges)
• Add both as devDependencies for local build/test
• Fix stale ^0.0.0-beta.0 stellar-wallets-kit pin to ^2.5.0
• Add CHANGELOG.md to files field
• Add 6 keywords: dapp, defi, xlm, freighter, wallet-kit, soroban-contracts

Closes #210

Description

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Related Issues

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Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

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• Build succeeds (npm run build)
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• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
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