Allow ranges for excluded_sequences config option

[romac]

Summary

Allow ranges for excluded_sequences config option instead of having to specify each sequence number manually.

Problem Definition

Some operators need to exclude large sequence ranges which are unpractical to specify one by one, eg. we've head of ranges which span 32k sequence numbers.

Proposal

Change the deserialization code for excluded_sequences to allow each element of the list to be either:

• a single sequence number, as an integer: e.g. 123456
• a range of sequence numbers, as a string: e.g. "123..456"

Let's discuss:

• what separator to use (.., ..=, -)
• whether or not the range should be inclusive
• whether to allow both inclusive and exclusive ranges

Acceptance Criteria

The following value for excluded_sequences is accepted:

excluded_sequences = [
  1, 2, 3, 4, 5,
  "6..9",
  10
]

and is equivalent to specifying:

excluded_sequences = [
  1, 2, 3, 4, 5,
  6, 7, 8, 9,
  10
]

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