upgrade spring-boot to 2.1.x and spring to 5.x

[chgxtony]

1. update spring dependency.
2. remove some redundant jar from pom.xml
3. performance enhancements for DateUtil

[boandai]

very good! thx!
we will publish this pr in version 1.0.3!

[davidzollo]

Due to the vulnerability, we also upgrade these jars :

upgrade fasterxml to 2.9.8
upgrade httpclient to 4.4.1

[davidzollo]

with upgrade of spring and spring boot , some configurations can't work ,
the module of escheduler-api , resource file application.properties also shoud update:

server port

server.port=12345

session config

server.servlet.session.timeout=7200

server.servlet.context-path=/escheduler/

file size limit for upload

spring.servlet.multipart.max-file-size=1024MB
spring.servlet.multipart.max-request-size=1024MB

post content

server.jetty.max-http-post-size=5000000

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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