Deprecate date_spine macro and sub macros

[QMalcolm]

Describe the bug

We've moved date_spine and it's sub-macros to dbt-core in dbt-labs/dbt-core#8616. As such we should deprecate these macros. The macros to be deprecated are

• date_spine
• generate_series
• get_intervals_between
• get_powers_of_two

Additional context

We use to have a deprecation function. However, we removed it in a previous PR. We should bring it back. We should also probably keep it around in the future even if nothing is using it at some given point in time as it's always possible more things will get deprecated as time goes on.

Acceptance Criteria

• A deprecation helper exists again
• The following have been deprecated: date_spine, generate_series, get_intervals_between, get_powers_of_two
• Uses of the deprecated functions in dbt-utils now use the dbt-core provided implementations
• Update docs in README of dbt_utils as-needed [1]

Are you interested in contributing the fix?

Yes

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