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Rollup merge of #154929 - davidgauch:const-default-lazy, r=jhpratt
Add `const Default` impls for `LazyCell` and `LazyLock`
Follow up to these commits by @estebank https://github.com/rust-lang/rust/pull/134628 and https://github.com/rust-lang/rust/pull/151190.
Tracking issue https://github.com/rust-lang/rust/issues/143894.
cc @fmease @fee1-dead @oli-obk
This enables `static L: LazyLock<D> = Default::default()` for any type `D: Default` which is safe as `D::default()` is only evaluated at runtime.
