feat: support the failure/success threshold for probe

[haoel]

This PR supports the failure/success threshold features - we can configure the number of continuously failed/successful probes to determine whether the endpoint status is DOWN or UP.

for example:

probe:
    failure: 2 # number of consecutive failed probes needed to determine the status down, default: 1
    success: 1 # number of consecutive successful probes needed to determine the status down, default: 1

close #230

[codecov-commenter]

Codecov Report

Base: 99.64% // Head: 99.65% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (fc6d6b8) compared to base (26c1c31).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #233   +/-   ##
=======================================
  Coverage   99.64%   99.65%           
=======================================
  Files          72       73    +1     
  Lines        5083     5164   +81     
=======================================
+ Hits         5065     5146   +81     
  Misses         12       12           
  Partials        6        6           

Impacted Files	Coverage Δ
conf/conf.go	96.73% <ø> (ø)
global/global.go	100.00% <ø> (ø)
global/probe.go	100.00% <100.00%> (ø)
probe/base/base.go	100.00% <100.00%> (ø)
probe/result.go	100.00% <100.00%> (ø)
probe/status.go	100.00% <100.00%> (ø)
probe/status_counter.go	100.00% <100.00%> (ø)
report/result.go	100.00% <0.00%> (ø)

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[proditis]

Minor change of continuously to consecutive.
Need to test run some cases still.