refactor!: change decoder's listener behavior

[muktihari]

Background: #182

BREAKING CHANGES:

• By default, Decoder no longer copy the message before send it to listeners for efficiency, the lifecycle of the mesg is only guaranteed before OnMesg method returns so any listener that process the message concurrently should copy the mesg before return. For legacy behavior (<= v0.14.0), use decoder.WithBroadcastMesgCopy()

What's Changed:

• filedef's Listener now copy the mesg before processing it concurrently to accommodate the behavior change. It copies the mesg using pool of reusable messages to reduce alloc.

Benchmark:

goos: darwin
goarch: amd64
pkg: github.com/muktihari/fit/decoder
cpu: Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
                    │   old.txt    │               new.txt                │
                    │    sec/op    │    sec/op     vs base                │
DecodeWithFiledef-4   105.53m ± 5%   90.92m ± 10%  -13.85% (p=0.002 n=10)

                    │   old.txt    │               new.txt                │
                    │     B/op     │     B/op      vs base                │
DecodeWithFiledef-4   92.47Mi ± 0%   49.77Mi ± 0%  -46.17% (p=0.000 n=10)

                    │   old.txt   │               new.txt               │
                    │  allocs/op  │  allocs/op   vs base                │
DecodeWithFiledef-4   200.0k ± 0%   100.1k ± 0%  -49.95% (p=0.000 n=10)

close #182

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5503e19) to head (2992a98).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #190   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           43        43           
  Lines         3549      3576   +27     
=========================================
+ Hits          3549      3576   +27     

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