Fix tax calculation for Ohio, Tax rounding and allow calculating VAT without providing ZIP

[bartech]

Description

Related issue(s)

Closes https://linear.app/a8c/issue/WOOSHIP-932/automatic-tax-rate-is-returning-the-wrong-rate-for-california-zip
Closes https://linear.app/a8c/issue/WOOSHIP-1646/automated-taxes-calculating-with-stores-base-address-for-ohio
Closes https://linear.app/a8c/issue/WOOSHIP-603/automated-taxes-fetching-rate-for-wrong-county-in-ohio
Closes https://linear.app/a8c/issue/WOOSHIP-1709/some-zipcodes-adds-the-incorrect-tax-total
Closes https://linear.app/a8c/issue/WOOSHIP-963/tax-rounding-product-level-order-level-values-in-api-response-do-not
Closes https://linear.app/a8c/issue/WOOSHIP-1712/tax-rounding-behaviour-after-32
Closes https://linear.app/a8c/issue/WOOSHIP-809/tax-calculation-doesnt-work-as-expected-on-the-cart-page-for-european

Steps to reproduce & screenshots/GIFs

Follow instructions in corresponding issue.

Used addresses

OH
Store:
4376 Edgarton Dr, Grove City, OH 43123

Checkout:
4376 Edgarton Dr, Grove City, OH 43123 should be 8% and falls in Franklin County.
223 W Water Street, Sandusky, OH 44870 should be 6.75% and falls in Erie County
953 Eden Park Dr, Cincinnati, OH 45202 should be 7.8% and falls in Hamilton County
7827 Redsky Dr, Cincinnati, OH 45249

CA
Store:
66 Highway 1, Carmel, CA 93923-9725
Checkout:
120 Highlands Drive, Carmel, CA 93923

NY
Store:
300 Pulteney St, Geneva, NY 14456
Checkout:
7921 Hickory Bottom Rd, Naples, NY 14512

AL
Store and Checkout
6415 Atlanta Hwy, Montgomery, AL 36117

California

Ohio

Tax Rounding

Item-level

Order-level

Case 2 Item-level

Case 2 Order-level (when adding each tax item you still get 1 cent discrepancy but order total is good)

Case 2 Order-level summary

Checklist

• unit tests

• changelog.txt entry added
• readme.txt entry added

[bartech]

I'm looking into why PHPUnit tests fails for 10.3

[dustinparker]

This fixes all of the tax issues mentioned. LGTM!