[Improve](metric) Improve FE DorisMetricRegistry

[w41ter]

The current implementation needs to iterate all metrics in a lock, which might cause latency spikes. This PR changes the underlying data structure to ConcurrentHashMap so that removing metrics doesn't need to block the entire registry.

[w41ter]

run buildall

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 45.62 seconds
stream load tsv: 595 seconds loaded 74807831229 Bytes, about 119 MB/s
stream load json: 22 seconds loaded 2358488459 Bytes, about 102 MB/s
stream load orc: 65 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 31 seconds loaded 861443392 Bytes, about 26 MB/s
insert into select: 28.8 seconds inserted 10000000 Rows, about 347K ops/s
storage size: 17162335253 Bytes

[w41ter]

run buildall

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 45.64 seconds
stream load tsv: 573 seconds loaded 74807831229 Bytes, about 124 MB/s
stream load json: 21 seconds loaded 2358488459 Bytes, about 107 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 33 seconds loaded 861443392 Bytes, about 24 MB/s
insert into select: 28.7 seconds inserted 10000000 Rows, about 348K ops/s
storage size: 17162343642 Bytes

[github-actions]

PR approved by anyone and no changes requested.

[dataroaring]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.