Tighten the write-buffer helpers after review

More of @gregmarr's review on the put_* split:

- Reattach the put_chars() doc comment, which the new helpers had been
  inserted in front of, leaving it describing put_indent().

- Compute the literal length once in put_literal() instead of spelling N - 1
  at each use.

- Add put_string(str, start, end), which keeps the pointer arithmetic and the
  bounds assertions inside the function instead of at the call site. With
  dump_float()'s to_chars() output moved onto put_buffer() as well, put_chars()
  now has no callers outside put_string()/put_buffer(): nothing passes a bare
  pointer and a count any more.

- Carry the indentation as std::size_t rather than unsigned int. It is a size,
  it is compared and combined with buffer sizes throughout, and the casts in
  put_indent() disappear. next_indent() keeps its assertion, which is far
  harder to trip on a 64-bit size_t but still reachable where that is 32 bits.

No output change: pretty and compact dumps, binary values included, are
byte-identical to develop.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

include/nlohmann/json.hpp

@@ -1345,7 +1345,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
 
         if (indent >= 0)
         {
-            s.dump(*this, true, ensure_ascii, static_cast<unsigned int>(indent));
+            s.dump(*this, true, ensure_ascii, static_cast<std::size_t>(indent));
         }
         else
         {