feat!: upgrade to v6

[liaoliaots]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe: apis, messages, comments, dependencies, refactor

What is the current behavior?

Issue Number: #175
redis and cluster module both are global module by default and no option to configure it

What is the new behavior?

• add isGlobal option as the second param and set its default value to true

// RedisModule
static forRoot(options: RedisModuleOptions = {}, isGlobal = true): DynamicModule;
static forRootAsync(options: RedisModuleAsyncOptions, isGlobal = true): DynamicModule;

// ClusterModule
static forRoot(options: ClusterModuleOptions, isGlobal = true): DynamicModule;
static forRootAsync(options: ClusterModuleAsyncOptions, isGlobal = true): DynamicModule;

• use correct method instead of instanceof to prevent some bugs in realms env
• change default namespace from Symbol('default') to 'default'
• remove status exports
• extract common utils
• update messages
• update comments
• update dependencies
• update unit tests

Does this PR introduce a breaking change?

• Yes
• No

Other information