feat: Remove sma_periods default value for StarcBands

[LeeDongGeon1996]

Description

• Remove sma_periods default value for StarcBands

Checklist

• My code follows the existing style, code structure, and naming taxonomy
• I have commented my code, particularly in hard-to-understand areas
• I have performed a self-review of my own code and included any verifying manual calculations
• I have added or updated unit tests that prove my fix is effective or that my feature works, and achieves sufficient code coverage. New and existing unit tests pass locally and in the build (below) with my changes
• My changes generate no new warnings and running code analysis does not produce any issues
• I have added or run the performance tests that depict optimal execution times
• I have made corresponding changes to the documentation

[LeeDongGeon1996]

@DaveSkender I'm worried about this can affect on user's side, if there's someone using sma_periods default value. Do we need to show only warning message in this version(v1.2.0)? And remove default value the next version(v1.3.0)?

[DaveSkender]

@DaveSkender I'm worried about this can affect on user's side, if there's someone using sma_periods default value. Do we need to show only warning message in this version(v1.2.0)? And remove default value the next version(v1.3.0)?

In these cases, to avoid a breaking change, C# has this convention to mark something as obsolete so it'll still work, but will produce a compiler warning, so I can hold off on fully removing the code until the next major vN.0.0 version where I'll be more explicit about documenting breaking changes in the release notes.

https://github.com/DaveSkender/Stock.Indicators/blob/eddb511ac060faf6270fa40c97253cdc509f08d5/src/_common/ObsoleteV2.cs#L53-L59