Implement minor performance improvements

- Use strbuf_append_mem() for small static strings (~2% speedup).
- Use &json_config_key for storing registry data. It's more unique
  and faster than a text string.
- Use strbuf_append_char_unsafe() for string quotes (~4% speedup).
- Use strbuf_append_number() instead of strbuf_append_fmt(). It is
  much simpler and avoids the potential for 2 expensive calls to
  vsnprintf().
- Make encoding buffer persistent across calls to avoid extra
  malloc/free (~4% speedup on example2.json).

These performance improvements can be much more pronounced depending
on the data. Eg, small strings, numbers, booleans, etc..

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