feat: add base to default rpc networks

[Prithpal-Sooriya]

Explanation

This adds the Base network as a network enabled by default.

Testdrive PRs:

• Extension: feat: enable base network by default metamask-extension#33448
• Mobile: feat: add base network to networks enabled by default metamask-mobile#16064

References

https://consensyssoftware.atlassian.net/browse/MMASSETS-773
https://consensyssoftware.atlassian.net/browse/MMASSETS-774

Changelog

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

[Prithpal-Sooriya]

@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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[cryptodev-2s]

LGTM!