refactor: introduce a newtype for vnode

[BugenZhao]

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What's changed and what's your intention?

To avoid leaking the logic to the upper layer, and makes specifying a new vnode count easier.

risingwave/src/common/src/hash/vnode.rs

Lines 24 to 28 in ce22f0c

	/// `VirtualNode` (a.k.a. VNode) is a minimal partition that a set of keys belong to. It is used for
	/// consistent hashing.
	#[repr(transparent)]
	#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, Display)]
	pub struct VirtualNode(VirtualNodeInner);

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

• fix(executor): DynamicFilter cache read strategy, fix LHS recovery #6016

[codecov]

Codecov Report

Merging #6513 (a81be6a) into main (bfa8334) will increase coverage by 0.07%.
The diff coverage is 86.95%.

@@            Coverage Diff             @@
##             main    #6513      +/-   ##
==========================================
+ Coverage   73.97%   74.05%   +0.07%     
==========================================
  Files         986      987       +1     
  Lines      161607   161641      +34     
==========================================
+ Hits       119556   119698     +142     
+ Misses      42051    41943     -108     

Flag	Coverage Δ
rust	74.05% <86.95%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/batch/src/executor/join/local_lookup_join.rs	56.28% <0.00%> (ø)
.../batch/src/task/consistent_hash_shuffle_channel.rs	0.00% <0.00%> (ø)
src/common/src/types/mod.rs	70.70% <ø> (ø)
src/common/src/util/scan_range.rs	76.81% <ø> (ø)
src/common/src/util/worker_util.rs	0.00% <ø> (ø)
...rc/frontend/src/optimizer/property/distribution.rs	67.60% <ø> (ø)
src/frontend/src/scheduler/distributed/stage.rs	19.92% <ø> (ø)
src/frontend/src/scheduler/plan_fragmenter.rs	69.83% <0.00%> (ø)
src/frontend/src/scheduler/worker_node_manager.rs	59.55% <ø> (ø)
src/meta/src/manager/catalog/fragment.rs	32.51% <ø> (ø)
... and 22 more

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[yezizp2012]

LGTM

[xx01cyx]

LGTM

[jon-chuang]

LGTM