[pkg/ottl] Boolean expressions are update to be able to handle comparing time.Time types

[TylerHelmuth]

In order to facilitate contexts returning time fields as time.Time we need to be able to compare time.Time values in boolean expressions. Although not supported by the grammar as literals, OTTL should allow working with these types.

When comparing time.Time fields, the following rules should be followed:

• time.Equal should be used to check if 2 times are equal.
• time.Before should be used to check if 1 time is earlier than another.
• time.After should be used to check if 1 time is later than another.

Given 2 times, A and B:

• A < B is true if and only if A.Before(B) is true.
• A <= B is true if A.Before(B) is true OR A.Equal(B) is true.
• A > B is true if and only if A.After(B) is true.
• A >= B is true if A.After(B) is true OR A.Equal(B) is true.
• A == B is true if and only if A.Equal(B) is true.
• A != B is true if and only if A.Equal(B) is false.

If either A or B is not a time, the comparison is false.

[fchikwekwe]

I'm working on this ticket. Please assign me @TylerHelmuth