feat: add more trace span and integrate with jaeger

[fatelei]

ref: https://github.com/cectc/dbpack/issues/

Ⅰ. Describe what this PR did

• integrate with jaeger
• add more trace span

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

jaeger trace result.

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #177 (e171f44) into dev (8290190) will decrease coverage by 0.24%.
The diff coverage is 11.46%.

@@            Coverage Diff             @@
##              dev     #177      +/-   ##
==========================================
- Coverage   43.05%   42.80%   -0.25%     
==========================================
  Files          81       81              
  Lines        9483     9554      +71     
==========================================
+ Hits         4083     4090       +7     
- Misses       4994     5058      +64     
  Partials      406      406              

Impacted Files	Coverage Δ
pkg/dt/mysql_undo_log_manager.go	0.00% <ø> (ø)
pkg/executor/sharding.go	0.00% <0.00%> (ø)
pkg/filter/dt/exec/prepare_delete.go	46.29% <0.00%> (-3.71%)	⬇️
pkg/filter/dt/exec/prepare_insert.go	30.76% <0.00%> (-1.42%)	⬇️
pkg/filter/dt/exec/prepare_update.go	51.08% <0.00%> (-4.87%)	⬇️
pkg/filter/dt/exec/query_delete.go	51.06% <0.00%> (-4.76%)	⬇️
pkg/filter/dt/exec/query_insert.go	28.72% <0.00%> (-1.28%)	⬇️
pkg/filter/dt/exec/query_update.go	53.84% <0.00%> (-5.19%)	⬇️
pkg/filter/dt/filter_http.go	15.74% <0.00%> (-0.61%)	⬇️
pkg/filter/dt/filter_mysql.go	1.58% <0.00%> (-0.03%)	⬇️
... and 7 more

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[dk-lockdown]

To trace the entire lifecycle of a transaction, should start with the http request proxy:

1. Get the TraceParent from the request header, and if it exists, pass it to the downstream service. Generate a new TraceParent if it does not exist and pass it downstream.
   

   dbpack/pkg/listener/http.go

   Line 102 in 03307dd

   request.SetHost(l.conf.BackendHost)

2. Users can put TraceParent into sql hints, dbpack gets TraceParent from sql hints to construct SpanContext, if it does not exist, generate a new SpanContext.

[dk-lockdown]

LGTM

[bohehe]

LGTM