Use naming from literature to reference optimization methods

[mlondschien]

Methods that are mentioned in the literature are

• Binary Segmentation, currently implemented via segmentation="BS" and optimizer="line_search".
• naive Optimistic Binary Segmentation, currently implemented via segmentation="BS" and optimizer="section_search"
• advanced Optimistic Binary Segmentation, not implemented
• Wild Binary Segmentation (Fryzlewicz), implemented via segmentation="WBS" and optimizer="line_search"
• Seeded Binary Segmentation (Kovacs), implemented via segmentation="SBS" and optimizer="line_search"
• (naive) Optimistic Seeded Binary Segmentation (OSeedBS, Kovacs), implemented via segmentation="SBS" and optimizer="section_search"

There is also optimizer="two_step_search", used for the non-parametric method with Random Forests, which to my knowledge does not have an established name used in literature yet.

[mlondschien]

Current TODOS: Check above list and discuss a possinble nameg for the two_step_search method together with SBS. We could add an additional parameter (name?) that can then take values BS, OBS, SBS, WBS, OSeedBS and the new name for two_step_search + SBS.