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Add Arc::{incr,decr}_strong_count
This adds two `unsafe` methods to `Arc`: `incr_strong_count` and `decr_strong_count`. A suggestion to add methods to change the strong count in `Arc` came up in during review in https://github.com/rust-lang/rust/pull/68700#discussion_r396169064, and from asking a few people this seemed like generally useful to have.
References:
- [Motivation from #68700](https://github.com/rust-lang/rust/pull/68700#discussion_r396169064)
- [Real world example in an executor](https://docs.rs/extreme/666.666.666666/src/extreme/lib.rs.html#13)