v9.0.0 - Trillium

• Turn off react/forbid-prop-types. Refs ESCONF-53.
• Allow <FormattedNumber> to accept string values in its style prop. Refs ESCONF-52.
• Enable eslint2020 and jest globals.
• Include yarn.lock to avoid future supply chain attacks. Refs ESCONF-56.
• BREAKING Bump @folio/stripes-webpack to v7. Refs ESCONF-56.