Add support for time.Time, time.Duration

[dekarrin]

time.Time is an extremely well-used type that may as well be a primitive in REZI. (Due to implementing encoding.BinaryMarshaler, time.Time is already supported).

It would also be nice to add/confirm support for time.Duration as it should be fairly easy to include.

• Add functions for proper encoding/decoding of time.Time. Add unit tests to confirm. Look towards behavior of json library to see how it handles that.

• Support time.Duration - Start by adding unit tests to see if this isn't already supported due to underlying type of int64. Add functions for proper encoding/decoding of time.Duration if needed.

• Add note to docs noting support for time.Time.

• If time.Duration not already supported, do all below tests for durations as well.

• [ ] Basic test of enc/decTime (primitives_test.go)

• [ ] Enc and Dec test with Time values (primtives_test.go)

• [ ] Test of Time within a map, Enc/Dec_Map_NoIndirection (maps_test.go)

• [ ] Test of Time within a slice, Enc/Dec_Slice_NoIndirection (slices_test.go)

• [ ] Test of Time written with Writer, Test_Writer_Enc (streams_test.go)

• [ ] Test of Time read from sequence with Reader, Test_Reader_Dec_sequential (streams_test.go)

• [ ] Test of Time read with Reader, new test Test_Reader_Dec_time (streams_test.go)

• [ ] Test of Time within a non-trivial structure, Test_EncAndDec_NontrivialStructure (rezi_test.go)

[dekarrin]

it does support time.Time as-is, but note that Go does not serialize the Location name when converting a Time to bytes. We may want to drop a note in docs somewhere about that.