Kmesh eBPF log user space dumping

[bfforever]

What type of PR is this? /kind feature /kind enhancement

What this PR does / why we need it:

1. Kmesh eBPF log user space dumping. version > 5.13 dump bpf log to userspace, otherwise print log in trace pipe.

2. Support dynamic bpf log level. k exec ds/kmesh -n kmesh-system -- curl -s localhost:15200/debug/bpfLogLevel/3

Which issue(s) this PR fixes: Fixes 388

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

When print bpf log to kmesh daemon process or user space, just use BPF_LOG_U instead of BPF_LOG, the args which input is same as BPF_LOG.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 67 lines in your changes missing coverage. Please review.

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Flag	Coverage Δ
unittests	36.41% <0.00%> (+4.40%)	:arrow_up:

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Files	Coverage Δ
pkg/controller/controller.go	0.00% <0.00%> (ø)
pkg/status/status_server.go	13.22% <0.00%> (-2.32%)	:arrow_down:
pkg/logger/logger.go	34.42% <0.00%> (-56.88%)	:arrow_down:

... and 6 files with indirect coverage changes

[bfforever]

can we use bpf_snprintf_btf, which is supported since 5.10

Possiblely can't, I see this function use to render type info with type value of a certain struct, to output a string, not provide format capability.

[bfforever]

/hold

[bfforever]

/unhold

[nlgwcy]

Good Job~ The following two points can be optimized in the future:

1. byte order conversion in ip2str can be extracted.
2. execute ip2str according to the log level. (e.g: IP2STR_ON_ERR/IP2STR_ON_DBG/...)

[nlgwcy]

/lgtm /approve

[kmesh-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nlgwcy

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kmesh-net/kmesh/blob/main/OWNERS)~~ [nlgwcy] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[bfforever]

Good Job~ The following two points can be optimized in the future:

1. byte order conversion in ip2str can be extracted.
2. execute ip2str according to the log level. (e.g: IP2STR_ON_ERR/IP2STR_ON_DBG/...)

Okay.

[hzxuzhonghu]

can you add a document on this feature to website https://kmesh.net/en/docs/

[bfforever]

can you add a document on this feature to website https://kmesh.net/en/docs/

Of course.