feat: http debug api for config

[ShiKaiWi]

Which issue does this PR close?

Closes #693

Rationale for this change

Refer to #693

What changes are included in this PR?

• Support debug api for reviewing the config when running;

Are there any user-facing changes?

Yes. Try the new api /debug/config, which will output the runtime config in json format.

How does this change test

Manually. Here is the output of the api:

[node]
addr = "127.0.0.1"
zone = ""
idc = ""
binary_version = ""

[server]
bind_addr = "0.0.0.0"
mysql_port = 3307
http_port = 5440
grpc_port = 8831
http_max_body_size = 65536
grpc_server_cq_count = 20
resp_compress_min_length = "4MiB"
auto_create_table = true

[server.forward]
enable = false
thread_num = 4
max_send_msg_len = 20971520
max_recv_msg_len = 1073741824
keep_alive_while_idle = true

[server.forward.keep_alive_interval]
secs = 600
nanos = 0

[server.forward.keep_alive_timeout]
secs = 3
nanos = 0

[server.forward.connect_timeout]
secs = 3
nanos = 0

[server.forward.forward_timeout]
secs = 60
nanos = 0

[runtime]
read_thread_num = 8
write_thread_num = 8
meta_thread_num = 2
background_thread_num = 8

[logger]
level = "info"
enable_async = true
async_channel_len = 102400

[tracing]
prefix = "tracing"
dir = "/tmp/ceresdb"
level = "info"

[analytic]
replay_batch_size = 500
max_replay_tables_per_batch = 64
write_group_worker_num = 8
write_group_command_channel_cap = 128
sst_meta_cache_cap = 1000
sst_data_cache_cap = 1000
space_write_buffer_size = 0
db_write_buffer_size = 0
scan_batch_size = 500
sst_background_read_parallelism = 8

[analytic.storage]
mem_cache_capacity = "512MiB"
mem_cache_partition_bits = 6
disk_cache_capacity = "0KiB"
disk_cache_page_size = "2MiB"
disk_cache_dir = "/tmp/ceresdb"

[analytic.storage.object_store]
type = "Local"
data_dir = "/tmp/ceresdb"

[analytic.table_opts]
update_mode = "Overwrite"
storage_format_hint = "Auto"
enable_ttl = true
ttl = "7d"
arena_block_size = 2097152
write_buffer_size = 33554432
compaction_strategy = "Default"
num_rows_per_row_group = 8192
compression = "Zstd"

[analytic.compaction_config]
schedule_channel_len = 16
schedule_interval = "30m"
max_ongoing_tasks = 8
max_unflushed_duration = "5h"
memory_limit = "4GiB"

[analytic.manifest]
snapshot_every_n_updates = 10000
scan_timeout = "5s"
scan_batch_size = 100
store_timeout = "5s"

[analytic.wal]
type = "RocksDB"
data_dir = "/tmp/ceresdb"

[analytic.remote_engine_client]
connect_timeout = "3s"
channel_pool_max_size_per_partition = 16
channel_pool_partition_num = 16
channel_keep_alive_while_idle = true
channel_keep_alive_timeout = "3s"
channel_keep_alive_interval = "10m"
route_cache_max_size_per_partition = 16
route_cache_partition_num = 16

[query_engine]
read_parallelism = 8

[limiter]
write_block_list = []
read_block_list = []
rules = []

[codecov-commenter]

Codecov Report

Merging #733 (d919118) into main (8837aa6) will increase coverage by 0.16%.
The diff coverage is 79.20%.

❗ Current head d919118 differs from pull request most recent head a4298fb. Consider uploading reports for the commit a4298fb to get more accurate results

@@            Coverage Diff             @@
##             main     #733      +/-   ##
==========================================
+ Coverage   68.26%   68.42%   +0.16%     
==========================================
  Files         288      294       +6     
  Lines       45335    45710     +375     
==========================================
+ Hits        30946    31278     +332     
- Misses      14389    14432      +43     

Impacted Files	Coverage Δ
analytic_engine/src/memtable/mod.rs	81.25% <ø> (ø)
analytic_engine/src/row_iter/chain.rs	55.80% <0.00%> (-0.76%)	⬇️
cluster/src/config.rs	75.00% <0.00%> (ø)
common_util/src/config.rs	87.02% <0.00%> (ø)
components/logger/src/lib.rs	27.98% <0.00%> (ø)
components/tracing_util/src/logging.rs	0.00% <0.00%> (ø)
query_engine/src/config.rs	83.33% <0.00%> (ø)
router/src/rule_based.rs	0.00% <0.00%> (ø)
server/src/config.rs	37.64% <0.00%> (ø)
server/src/grpc/forward.rs	79.48% <0.00%> (ø)
... and 33 more

... and 2 files with indirect coverage changes

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[jiacai2050]

LGTM