rsjson-lua 0.3.0

a json lua module using the serde-json rust crate
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# Benchmarks

Benchmarks are in the `bench` folder, and they can be run with the following
commands, where `{iters}` is the number of iterations to run (defaults to
`100`). They use the [`luamark`](https://github.com/jeffzi/luamark) module

```shell
# time benchmarks
lx --lua-version 5.4 lua --test bench/time.lua {iters}

# memory benchmarks
lx --lua-version 5.4 lua --test bench/mem.lua {iters}
```

Here is a comparison between `cjson` and `dkjson` (with the lpeg extension enabled):

Time:

```shell
--------------------
Encoding (Time): 1000 iters
--------------------
pretty=false
  Name     Rank     Relative     Median    Ops  
---------  ----  --------------  ------  -------
cjson        ≈1  █           1x     2ms    500/s
rapidjson    ≈1  █           1x     2ms    500/s
rsjson        3  ██       ↓4.5x     9ms  111.1/s
dkjson        4  ████████  ↓15x    30ms   33.3/s

# NOTE: the cjson benchmark does not implement pretty formatting
pretty=true
  Name     Rank     Relative      Median   Ops  
---------  ----  ---------------  ------  ------
cjson        ≈1  █            1x     2ms   500/s
rapidjson    ≈1  █            1x     2ms   500/s
rsjson        3  ██          ↓5x    10ms   100/s
dkjson        4  ████████ ↓16.5x    33ms  30.3/s

--------------------
Decoding (Time): 1000 iters
--------------------
  Name     Rank    Relative    Median   Ops
---------  ----  ------------  ------  -----
cjson        ≈1  █         1x     2ms  500/s
rapidjson    ≈1  █         1x     2ms  500/s
rsjson        3  ██████   ↓4x     8ms  125/s
dkjson        4  ████████ ↓5x    10ms  100/s
```

Memory:

```shell
--------------------
Encoding (Mem): 1000 iters
--------------------
  Name     Rank     Relative        Median  
---------  ----  ---------------  -----------
cjson         1  ███          1x         13kB
dkjson        2  ██████   ↓1.92x         24kB
rsjson       ≈3  ███████  ↓2.15x  27kB ± 155B
rapidjson    ≈3  ████████ ↓2.29x  29kB ± 17kB

--------------------
Decoding (Mem): 1000 iters
--------------------
  Name     Rank     Relative        Median  
---------  ----  ---------------  -----------
rsjson       ≈1  █            1x   5kB ± 22kB
dkjson       ≈1  ████     ↓2.43x   13kB ± 3kB
rapidjson     3  ███████  ↓4.12x         21kB
cjson         4  ████████ ↓4.61x  24kB ± 880B
```