Save pageSize setting into sessionStorage

[LJXSean]

Summary:

Fixes #1051

Changes Made:

• Create a new attribute directive for <mat-paginator> found in issue-tables component

  • This directive provides a getter and setter for the pageSize selected in <mat-paginator>
  • pageSize is stored in sessionStorage
  • Each app-issue-table stores its own pageSize using a unique key

• Add an @input table_name to issue-tables component

  • This table_name is passed into the new attribute directive to be used as the table key of the pageSize variable in sessionStorage

• Add the attribute 'table_name' to the <app-issue-tables> tag in the following component html templates:

  • phase-bug-reporting
  • phase-moderation
  • issues-faulty
  • issues-pending
  • issues-responded
  • issue-faulty
  • issue-pending
  • issue-accepted
  • issue-responded

Demo

Proposed Commit Message:

Add attribute directive to mat-paginator

The selected items per page setting for each issue table is lost 
after navigation to a different page or on refresh.

Caching this setting is more user-friendly because users do 
not need to re-input the same page settings.

Let's save this setting to session storage using an attribute directive.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6b092b1) 53.97% compared to head (7130730) 53.97%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1207 +/- ## ======================================= Coverage 53.97% 53.97% ======================================= Files 101 101 Lines 2881 2881 Branches 534 534 ======================================= Hits 1555 1555 Misses 984 984 Partials 342 342 ``` | [Files Changed](https://app.codecov.io/gh/CATcher-org/CATcher/pull/1207?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CATcher-org) | Coverage Δ | | |---|---|---| | [.../app/shared/issue-tables/issue-tables.component.ts](https://app.codecov.io/gh/CATcher-org/CATcher/pull/1207?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CATcher-org#diff-c3JjL2FwcC9zaGFyZWQvaXNzdWUtdGFibGVzL2lzc3VlLXRhYmxlcy5jb21wb25lbnQudHM=) | `14.13% <ø> (ø)` | |

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