Add starts_with() and ends_with() algorithms

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1754390) 97.68% compared to head (8d5add2) 97.68%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #64 +/- ## ======================================= Coverage 97.68% 97.68% ======================================= Files 59 59 Lines 1948 1948 ======================================= Hits 1903 1903 Misses 45 45 ``` | [Impacted Files](https://app.codecov.io/gh/tcbrindle/flux/pull/64?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tristan+Brindle) | Coverage Δ | | |---|---|---| | [include/flux/core/inline\_sequence\_base.hpp](https://app.codecov.io/gh/tcbrindle/flux/pull/64?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tristan+Brindle#diff-aW5jbHVkZS9mbHV4L2NvcmUvaW5saW5lX3NlcXVlbmNlX2Jhc2UuaHBw) | `90.90% <ø> (ø)` | |

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