feat: dynamic swap stablecoins and default slippage selector

[micaelae]

Explanation

Adds a new selector selectDefaultSlippagePercentage that returns the default slippage for a given chain and token combination

• Returns 0.5 if requesting a bridge quote
• Returns undefined (auto) if requesting a Solana swap
• Returns 0.5 if both tokens are stablecoins (based on dynamic stablecoins list from LD chain config)
• Returns 2 for all other EVM swaps

Clients can migrate existing slippage default logic and stablecoin config to this selector. Example usage:

const getDefaultSlippage = createSelector(
  [
    (state) => state.metamask,
    (state) => getFromChain(state)?.chainId,
    (state) => getToChain(state)?.chainId,
    (state) => getFromToken(state)?.address,
    (state) => getToToken(state)?.address,
  ],
  (
    controllerStates,
    srcChainId,
    destChainId,
    srcTokenAddress,
    destTokenAddress,
  ) => {
    return selectDefaultSlippagePercentage(controllerStates, {
      srcChainId,
      destChainId,
      srcTokenAddress,
      destTokenAddress,
    });
  },
);

Extension integration PR: MetaMask/metamask-extension#35961

References

Fixes https://consensyssoftware.atlassian.net/browse/SWAPS-2873

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[micaelae]

@metamaskbot publish-preview

[github-actions]

Preview builds have been published. See these instructions for more information about preview builds.

Expand for full list of packages and versions.

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