Can Write LPA with PIE or Pregel with GAE in GraphScope?

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#2601

With this doc https://graphscope.io/docs/analytics_engine.html#

Can write algo in [PIE、Pregel、Java]

Can distributed LPA be realized through the above framework?

This is chat-gpt answer

IN Pregel
```
from graphscope.analytical.udf.decorators import pregel
from graphscope.framework.app import AppAssets

@pregel(vd_type='int', md_type='double')
class LPA_Pregel(AppAssets):

@staticmethod
def Init(v, context):
v.set_value(v.id())

@staticmethod
def Compute(messages, v, context):
labels = {}
max_label_count = 0
for message in messages:
if message not in labels:
labels[message] = 0
labels[message] += 1
max_label_count = max(max_label_count, labels[message])

if v.value() not in labels:
labels[v.value()] = 0
labels[v.value()] += 1
max_label_count = max(max_label_count, labels[v.value()])

for label, count in labels.items():
if count == max_label_count:
v.set_value(label)
break

for edge in v.outgoing_edges():
v.send(edge.vertex(), v.value())

@staticmethod
def Combine(messages):
label_count = {}
for label in messages:
if label not in label_count:
label_count[label] = 0
label_count[label] += 1

max_label = None
max_count = 0
for label, count in label_count.items():
if count > max_count:
max_count = count
max_label = label

return max_label

```

but there is some mistake when running LPA_Pregel

```
# load my algorithm
my_app = LPA_Pregel()

ret = my_app(graph)
```

log

```
Error compiling Cython file:
------------------------------------------------------------
...
max_count = count
max_label = label
return max_label

cdef public void Init(Vertex[int32_t, double] &v, Context[int32_t, double] &context):
v.set_value(v.id())
^
------------------------------------------------------------

LPA_Pregel_1682080147.pyx:46:20: Cannot assign type 'string' to 'const int32_t'

Error compiling Cython file:
------------------------------------------------------------
...
max_label_count = max(max_label_count, labels[v.value()])
for label, count in labels.items():
if count == max_label_count:
v.set_value(label)
break
for edge in v.outgoing_edges():
^
------------------------------------------------------------

LPA_Pregel_1682080147.pyx:64:32: Call with wrong number of arguments (expected 1, got 0)

Error compiling Cython file:
------------------------------------------------------------
...
max_label_count = max(max_label_count, labels[v.value()])
for label, count in labels.items():
if count == max_label_count:
v.set_value(label)
break
for edge in v.outgoing_edges():
^
------------------------------------------------------------

LPA_Pregel_1682080147.pyx:64:16: Cannot convert Python object to 'Neighbor[int32_t,double]'

```