feat: add server option for NotFoundHandler and MethodNotAllowedHandler

[liubing0427]

Description (what this PR does / why we need it):

pprof will be registered to DefaultServeMux by default, and go-kratos's NotFoundHandler and MethodNotAllowedHandler will use DefaultServeMux, resulting in the inability to flexibly control the switch of pprof.
This PR adds ServerOption to modify NotFoundHandler and MethodNotAllowedHandler

Which issue(s) this PR fixes (resolves / be part of):

Other special notes for the reviewers:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (856bc9a) 84.43% compared to head (85abb47) 84.55%.
Report is 1 commits behind head on main.

❗ Current head 85abb47 differs from pull request most recent head 36b648d. Consider uploading reports for the commit 36b648d to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3131      +/-   ##
==========================================
+ Coverage   84.43%   84.55%   +0.12%     
==========================================
  Files          88       88              
  Lines        3983     3989       +6     
==========================================
+ Hits         3363     3373      +10     
+ Misses        443      441       -2     
+ Partials      177      175       -2     

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