feat(explore): Allow basic keyboard navigation within arithmetic builder

[Zylphrex]

The navigations weren't fully working so fix it up here and add tests.

[codecov]

❌ 6 Tests Failed:

Tests completed	Failed	Passed	Skipped
8578	6	8572	3

View the top 3 failed test(s) by shortest run time

token ArithmeticTokenOperator renders multiply operator

Stack Traces | 0.104s run time

Error: expect(jest.fn()).toHaveBeenCalledWith(...expected)

Expected: {"token": ObjectContaining {"kind": "op", "operator": "*"}, "type": "DELETE_TOKEN"}
Received
       1
          Object {
        -   "token": ObjectContaining {
        +   "focusOverride": Object {
        +     "itemKey": "str:0",
        +   },
        +   "token": TokenOperator {
        +     "key": "op:0",
              "kind": "op",
        +     "location": Object {
        +       "end": Object {
        +         "column": 2,
        +         "line": 1,
        +         "offset": 1,
        +       },
        +       "source": undefined,
        +       "start": Object {
        +         "column": 1,
        +         "line": 1,
        +         "offset": 0,
        +       },
        +     },
              "operator": "*",
            },
            "type": "DELETE_TOKEN",
          },
       2
          Object {
        -   "token": ObjectContaining {
        -     "kind": "op",
        -     "operator": "*",
        -   },
        -   "type": "DELETE_TOKEN",
        +   "type": "RESET_FOCUS_OVERRIDE",
          },

Number of calls: 2
    at Object.<anonymous> (.../arithmeticBuilder/token/index.spec.tsx:355:24)

token ArithmeticTokenParenthesis renders left parenthesis

Stack Traces | 0.107s run time

Error: expect(jest.fn()).toHaveBeenCalledWith(...expected)

Expected: {"token": ObjectContaining {"kind": "paren", "parenthesis": "("}, "type": "DELETE_TOKEN"}
Received
       1
          Object {
        -   "token": ObjectContaining {
        +   "focusOverride": Object {
        +     "itemKey": "str:0",
        +   },
        +   "token": TokenParenthesis {
        +     "key": "paren:0",
              "kind": "paren",
        +     "location": Object {
        +       "end": Object {
        +         "column": 2,
        +         "line": 1,
        +         "offset": 1,
        +       },
        +       "source": undefined,
        +       "start": Object {
        +         "column": 1,
        +         "line": 1,
        +         "offset": 0,
        +       },
        +     },
              "parenthesis": "(",
            },
            "type": "DELETE_TOKEN",
          },
       2
          Object {
        -   "token": ObjectContaining {
        -     "kind": "paren",
        -     "parenthesis": "(",
        -   },
        -   "type": "DELETE_TOKEN",
        +   "type": "RESET_FOCUS_OVERRIDE",
          },

Number of calls: 2
    at Object.<anonymous> (.../arithmeticBuilder/token/index.spec.tsx:396:24)

token ArithmeticTokenParenthesis renders right parenthesis

Stack Traces | 0.115s run time

Error: expect(jest.fn()).toHaveBeenCalledWith(...expected)

Expected: {"token": ObjectContaining {"kind": "paren", "parenthesis": ")"}, "type": "DELETE_TOKEN"}
Received
       1
          Object {
        -   "token": ObjectContaining {
        +   "focusOverride": Object {
        +     "itemKey": "str:0",
        +   },
        +   "token": TokenParenthesis {
        +     "key": "paren:0",
              "kind": "paren",
        +     "location": Object {
        +       "end": Object {
        +         "column": 2,
        +         "line": 1,
        +         "offset": 1,
        +       },
        +       "source": undefined,
        +       "start": Object {
        +         "column": 1,
        +         "line": 1,
        +         "offset": 0,
        +       },
        +     },
              "parenthesis": ")",
            },
            "type": "DELETE_TOKEN",
          },
       2
          Object {
        -   "token": ObjectContaining {
        -     "kind": "paren",
        -     "parenthesis": ")",
        -   },
        -   "type": "DELETE_TOKEN",
        +   "type": "RESET_FOCUS_OVERRIDE",
          },

Number of calls: 2
    at Object.<anonymous> (.../arithmeticBuilder/token/index.spec.tsx:416:24)

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