feat: add consul discovery module

[Fabriceli]

Description

As I mentioned previously in #8371 , my team submit our consul discovery module

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[spacewander]

Please make the CI pass, thanks!

[Fabriceli]

Please make the CI pass, thanks!

ok, i fixed it

[Fabriceli]

Learn more.

Could you start the other pipeline?

[spacewander]

Learn more.

Could you start the other pipeline?

Done

[tzssangglass]

pls fix doc lint

[Fabriceli]

pls fix doc lint

done

[Fabriceli]

@spacewander @tzssangglass I had finished, and I had fixed all the CI error

[Fabriceli]

@spacewander @tzssangglass Updated, please check again, thanks

[Fabriceli]

@spacewander @tzssangglass the CI with the t/xds-library/config_xds_2.t TEST 7 is not stable, I did not modified anything about that

[Fabriceli]

@spacewander @tzssangglass May you RETURN CI to rerun the CI again, thanks

[spacewander]

@Fabriceli
Could you follow the discussion in #8433 (comment)?
Thanks!

[Fabriceli]

@Fabriceli Could you follow the discussion in #8433 (comment)? Thanks!

DONE, I had merge upstream master to dev branch.

[Fabriceli]

@Fabriceli Could you follow the discussion in #8433 (comment)? Thanks!

[Fabriceli]

@spacewander @tzssangglass I have merged upstream master, could you re-start the CI? Thanks

[Fabriceli]

Some error in Chaos Test, May you give some hint about that? cc @spacewander @tzssangglass

Failure [0.077 seconds]
Test APISIX Delay When Add ETCD Delay
/home/runner/work/apisix/apisix/t/chaos/delayetcd/delayetcd.go:100
  get default apisix delay [It]
  /home/runner/work/apisix/apisix/t/chaos/delayetcd/delayetcd.go:133

  Expected
      <time.Duration>: 15246514
  to be <
      <time.Duration>: 15000000

  /home/runner/work/apisix/apisix/t/chaos/delayetcd/delayetcd.go:136

Error Stack: https://github.com/apache/apisix/actions/runs/3617352817/jobs/6100135416

[tzssangglass]

Some error in Chaos Test, May you give some hint about that

rerun it

[Fabriceli]

Please take a look at this CR, thanks, cc @spacewander