Kefu Chai ecb5380638 treewide: s/boost::lexical_cast<std::string>/fmt::to_string()/ ...

this change replaces all occurrences of `boost::lexical_cast<std::string>`
in the source tree with `fmt::to_string()`. for couple reasons:

* `boost::lexical_cast<std::string>` is longer than `fmt::to_string()`,
  so the latter is easier to parse and read.
* `boost::lexical_cast<std::string>` creates a stringstream under the
  hood, so it can use the `operator<<` to stringify the given object.
  but stringstream is known to be less performant than fmtlib.
* we are migrating to fmtlib based formatting, see #13245. so
  using `fmt::to_string()` helps us to remove yet another dependency
  on `operator<<`.

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes #13611

2023-04-21 09:43:53 +03:00

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