Issue 1545 variable length relationships with with_associations

[amitsuryavanshi]

Fixes #1545

This pull introduces/changes:

• You can use * to eager load relationships with variable length like: person.blog_posts.with_associations('comments.owner.friends*') Here all the friends relationships, any level deep will be eager loaded.

• To get fixed length relationships you can use *<length> like: person.blog_posts.with_associations('comments.owner.friends*2') This will eager load friends relationship till 2 levels deep.

[codecov-io]

Codecov Report

Merging #1546 into master will decrease coverage by 0.17%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1546      +/-   ##
==========================================
- Coverage    93.4%   93.22%   -0.18%     
==========================================
  Files         104      105       +1     
  Lines        4809     4756      -53     
==========================================
- Hits         4492     4434      -58     
- Misses        317      322       +5

Impacted Files	Coverage Δ
...o4j/active_node/query/query_proxy_eager_loading.rb	100% <100%> (ø)	:arrow_up:
lib/neo4j/active_node/has_n.rb	99.18% <100%> (+0.77%)	:arrow_up:
...uery/query_proxy_eager_loading/association_tree.rb	100% <100%> (ø)
lib/neo4j.rb	97.95% <100%> (+0.02%)	:arrow_up:
lib/neo4j/session_manager.rb	86.66% <0%> (-8.99%)	:arrow_down:
lib/neo4j/active_node/id_property.rb	93.13% <0%> (-4.91%)	:arrow_down:
lib/neo4j/migrations/helpers/id_property.rb	83.33% <0%> (-4.77%)	:arrow_down:
lib/neo4j/active_rel/types.rb	97.14% <0%> (-2.86%)	:arrow_down:
lib/neo4j/shared/query_factory.rb	96.49% <0%> (-1.79%)	:arrow_down:
lib/neo4j/shared/declared_property.rb	93.75% <0%> (-1.57%)	:arrow_down:
... and 34 more

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