Feat: Custom time ranges should support offsets

[mindspank]

Problem Today when defining custom ranges you can define ISO durations that uses Max(timestamp)/Today as the end period. We should introduce the ability to define a custom end period/offset so that users can craft custom ranges such as

• Yesterday
• Previous Month
• Previous Quarter
• Previous Year

AC:

• A user can define custom periods like the ones above
• A user can specify comparison offsets that inherits the offset from the time range
• Timerange: Previous Year Comparison Period: 2 years ago