Added option to include exchange rate multiplier during import (#690)

* Addd option to include exchange rate during import

* Added changes to multipler option within form

* Use Input component

* build fixes

* Fix parsing errors

* lint fixes

* Update packages/loot-design/src/components/modals/ImportTransactions.js

Co-authored-by: Matiss Janis Aboltins <matiss@mja.lv>

* Update packages/loot-design/src/components/modals/ImportTransactions.js

Co-authored-by: Matiss Janis Aboltins <matiss@mja.lv>

* Update packages/loot-design/src/components/modals/ImportTransactions.js

Co-authored-by: Matiss Janis Aboltins <matiss@mja.lv>

* Variable name updates

* Record a trace when retrying failing tests

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Co-authored-by: Matiss Janis Aboltins <matiss@mja.lv>
Co-authored-by: Jed Fox <git@jedfox.com>